1959 March 10 - Launch Vehicle: X-15. X-15 1-C-1 X-15A test Agency: NASA/USAF. Apogee: 11 km (6 mi). X-15 captive flight

1959 April 1 - Launch Vehicle: X-15. X-15 1-A-2 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 11 km (6 mi).

1959 April 10 - Launch Vehicle: X-15. X-15 1-A-3 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 11 km (6 mi).

1959 May 21 - Launch Vehicle: X-15. X-15 1-A-4 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 11 km (6 mi).

1959 July 24 - Launch Vehicle: X-15. X-15 2-C-1 X-15A test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1959 September 4 - Launch Vehicle: X-15. X-15 2-A-2 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1959 October 10 - Launch Vehicle: X-15. X-15 2-A-4 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1959 October 14 - Launch Vehicle: X-15. X-15 2-A-5 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1959 October 22 - Launch Vehicle: X-15. X-15 2-A-7 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1959 October 31 - Launch Vehicle: X-15. X-15 2-A-8 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1959 December 16 - Launch Vehicle: X-15. X-15 1-A-6 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 February 4 - Launch Vehicle: X-15. X-15 2-A-10 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 March 18 - Launch Vehicle: X-15. X-15 2-A-14 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 May 5 - Launch Vehicle: X-15. X-15 2-A-17 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 May 27 - Launch Vehicle: X-15. X-15 1-A-14 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 June 3 - Launch Vehicle: X-15. X-15 1-A-15 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 June 8 - Launch Vehicle: X-15. X-15 1-A-16 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 August 11 - Launch Vehicle: X-15. X-15 1-A-18 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 August 18 - Launch Vehicle: X-15. X-15 1- A-20 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 September 2 - Launch Vehicle: X-15. X-15 1- A-22 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 September 20 - Launch Vehicle: X-15. X-15 1- A-24 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 October 11 - Launch Vehicle: X-15. X-15 1- A-26 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 October 13 - Launch Vehicle: X-15. X-15 2-A-19 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 November 4 - Launch Vehicle: X-15. X-15 2-A-20 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1960 December 15 - Launch Vehicle: X-15. X-15 1- A-33 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 January 11 - Launch Vehicle: X-15. X-15 1- A-34 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 February 21 - Launch Vehicle: X-15. X-15 2- A-24 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 February 24 - Launch Vehicle: X-15. X-15 2- A-25 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 March 21 - Launch Vehicle: X-15. X-15 2- A-27 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 May 19 - Launch Vehicle: X-15. X-15 2- A-30 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 June 20 - Launch Vehicle: X-15. X-15 2- A-32 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 September 29 - Launch Vehicle: X-15. X-15 1- A-38 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 October 27 - Launch Vehicle: X-15. X-15 1- A-41 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 November 2 - Launch Vehicle: X-15. X-15 1- A-42 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 November 3 - Launch Vehicle: X-15. X-15 1- A-43 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1961 December 19 - Launch Vehicle: X-15. X-15 3-A-1 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 March 29 - Launch Vehicle: X-15. X-15 3-A-4 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 March 30 - Launch Vehicle: X-15. X-15 3-A-5 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 March 31 - Launch Vehicle: X-15. X-15 3-A-6 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 April 18 - Launch Vehicle: X-15. X-15 1- A-45 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 April 25 - Launch Vehicle: X-15. X-15 2- A-38 FAILURE: Failure. X-15A test Agency: NASA/USAF. Apogee: 14 km (8 mi). Maximum Speed - 5879 kph. Maximum Altitude - 32160 m.

1962 April 26 - Launch Vehicle: X-15. X-15 2- A-39 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 April 27 - Launch Vehicle: X-15. X-15 1- A-47 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 May 2 - Launch Vehicle: X-15. X-15 (3-C) Eglin Demonstration mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 May 25 - Launch Vehicle: X-15. X-15 2- A-41 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 May 29 - Launch Vehicle: X-15. X-15 2- A-42 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 July 10 - Launch Vehicle: X-15. X-15 3-A-11 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 July 11 - Launch Vehicle: X-15. X-15 3-A-12 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 July 16 - Launch Vehicle: X-15. X-15 3-A-13 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 August 1 - Launch Vehicle: X-15. X-15 3-A-15 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 August 10 - Launch Vehicle: X-15. X-15 3-A-17 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 September 27 - Launch Vehicle: X-15. X-15 2- A-49 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1962 December 13 - Launch Vehicle: X-15. X-15 3- A-21 FAILURE: Failure. VO Stab, UVP Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 May 10 - Launch Vehicle: X-15. X-15 3- A-27 FAILURE: Failure. X-15A Test/Ultraviolet Astronomy/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 July 3 - Launch Vehicle: X-15. X-15 1- A-58 FAILURE: Failure. X-15A Technology/test Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 July 17 - Launch Vehicle: X-15. X-15 1- A-60 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 August 6 - Launch Vehicle: X-15. X-15 3- A-33 FAILURE: Failure. X-15A Test/Aeronomy mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 August 13 - Launch Vehicle: X-15. X-15 3- A-34 FAILURE: Failure. X-15A Test/Aeronomy mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 August 15 - Launch Vehicle: X-15. X-15 3- A-35 FAILURE: Failure. X-15A Test/Aeronomy mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 October 4 - Launch Vehicle: X-15. X-15 1- A-62 FAILURE: Failure. X-15A Test/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 October 14 - Launch Vehicle: X-15. X-15 3- A-37 FAILURE: Failure. X-15A Test/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 October 25 - Launch Vehicle: X-15. X-15 3- A-38 FAILURE: Failure. X-15A Sharp Upper Vert. test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Sharp Upper Vert.)

1963 November 19 - Launch Vehicle: X-15. X-15 3- A-40 FAILURE: Failure. X-15A Checkout mission Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Checkout)

1963 December 3 - Launch Vehicle: X-15. X-15 1- A-66 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1963 December 18 - Launch Vehicle: X-15. X-15 1- A-68 FAILURE: Failure. X-15A Opt Deg Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Opt Deg)

1964 March 17 - Launch Vehicle: X-15. X-15 1- A-71 FAILURE: Failure. X-15A Optical Degradation Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Optical Degradation)

1964 March 31 - Launch Vehicle: X-15. X-15 3- A-45 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 May 11 - Launch Vehicle: X-15. X-15 3- A-46 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 June 11 - Launch Vehicle: X-15. X-15 1- A-76 FAILURE: Failure. X-15A Technology/test Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 June 15 - Launch Vehicle: X-15. X-15 2- C-53 X-15A-2 Carry test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight (X-15A-2 modification)

1964 June 23 - Launch Vehicle: X-15. X-15 2- A-54 FAILURE: Failure. X-15A-2 Stability test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Stability)

1964 July 2 - Launch Vehicle: X-15. X-15 3- A-49 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 July 28 - Launch Vehicle: X-15. X-15 3- A-51 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 September 23 - Launch Vehicle: X-15. X-15 3- A-56 FAILURE: Failure. X-15A Test/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 October 2 - Launch Vehicle: X-15. X-15 1- A-78 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1964 October 29 - Launch Vehicle: X-15. X-15 3- C-58 X-15A Gear modification check test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight - gear mod check

1964 November 6 - Launch Vehicle: X-15. X-15 2- C-58 X-15A-2 test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1964 November 16 - Launch Vehicle: X-15. X-15 2- C-59 X-15A-2 test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1964 December 4 - Launch Vehicle: X-15. X-15 1- A-80 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 January 26 - Launch Vehicle: X-15. X-15 1- A-82 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 February 15 - Launch Vehicle: X-15. X-15 2- C-62 X-15A-2 test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1965 February 15 - Launch Vehicle: X-15. X-15 2- C-61 X-15A-2 test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1965 February 19 - Launch Vehicle: X-15. X-15 1- A-83 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 February 25 - Launch Vehicle: X-15. X-15 1- A-84 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 May 11 - Launch Vehicle: X-15. X-15 1- A-87 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 May 13 - Launch Vehicle: X-15. X-15 2- A-65 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 June 4 - Launch Vehicle: X-15. X-15 2- A-67 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 June 8 - Launch Vehicle: X-15. X-15 2- A-68 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 June 11 - Launch Vehicle: X-15. X-15 2- A-69 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 July 2 - Launch Vehicle: X-15. X-15 2- A-71 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 July 13 - Launch Vehicle: X-15. X-15 3- A-68 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 July 23 - Launch Vehicle: X-15. X-15 1- A-90 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 July 27 - Launch Vehicle: X-15. X-15 1- A-91 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 July 28 - Launch Vehicle: X-15. X-15 1- A-92 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 August 20 - Launch Vehicle: X-15. X-15 1- A-94 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 August 24 - Launch Vehicle: X-15. X-15 1- A-95 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 October 8 - Launch Vehicle: X-15. X-15 1- A-100 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1965 November 2 - Launch Vehicle: X-15. X-15 1- A-102 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 April 13 - Launch Vehicle: X-15. X-15 2- A-76 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 April 20 - Launch Vehicle: X-15. X-15 2- A-77 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 May 5 - Launch Vehicle: X-15. X-15 2- A-78 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 June 2 - Launch Vehicle: X-15. X-15 1- A-105 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 June 10 - Launch Vehicle: X-15. X-15 1- A-106 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 June 20 - Launch Vehicle: X-15. X-15 3- A-76 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 June 27 - Launch Vehicle: X-15. X-15 2- C-80 X-15A-2 External Tank test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight (External Tank Test)

1966 July 13 - Launch Vehicle: X-15. X-15 3- A-77 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 July 20 - Launch Vehicle: X-15. X-15 2- A-82 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 August 9 - Launch Vehicle: X-15. X-15 1- A-109 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 August 10 - Launch Vehicle: X-15. X-15 1- A-110 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 September 13 - Launch Vehicle: X-15. X-15 3- A-81 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 September 28 - Launch Vehicle: X-15. X-15 1- A-114 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 October 4 - Launch Vehicle: X-15. X-15 1- A-115 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 October 7 - Launch Vehicle: X-15. X-15 2- A-87 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 October 19 - Launch Vehicle: X-15. X-15 2- A-88 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 November 18 - Launch Vehicle: X-15. X-15 3- A-84 FAILURE: Failure. X-15A-2 test Agency: NASA/USAF. Apogee: 14 km (8 mi). Unofficial world's speed record. Maximum Speed - 6838 kph. Maximum Altitude - 30140 m.

1966 November 23 - Launch Vehicle: X-15. X-15 3- A-85 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1966 December 22 - Launch Vehicle: X-15. X-15 2- C-90 Test mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 March 15 - Launch Vehicle: X-15. X-15 1- A-117 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 March 21 - Launch Vehicle: X-15. X-15 1- A-118 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 April 20 - Launch Vehicle: X-15. X-15 1- A-120 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 May 5 - Launch Vehicle: X-15. X-15 2- A-91 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 May 12 - Launch Vehicle: X-15. X-15 3- A-88 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 May 25 - Launch Vehicle: X-15. X-15 1- A-122 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 June 1 - Launch Vehicle: X-15. X-15 1- A-123 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 June 14 - Launch Vehicle: X-15. X-15 1- A-124 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 August 7 - Launch Vehicle: X-15. X-15 2- C-93 X-15A-2 Ramjet flow test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight (Ramjet flow)

1967 August 11 - Launch Vehicle: X-15. X-15 2- A-94 FAILURE: Failure. X-15A-2 Ramjet flow test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 aborted launch (Ramjet flow)

1967 August 16 - Launch Vehicle: X-15. X-15 2- A-95 FAILURE: Failure. X-15A-2 aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 September 22 - Launch Vehicle: X-15. X-15 3- A-93 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1967 October 31 - Launch Vehicle: X-15. X-15 3- A-96 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 February 6 - Launch Vehicle: X-15. X-15 1- C-127 X-15A test Agency: NASA/USAF. Apogee: 14 km (8 mi). X-15 captive flight

1968 February 7 - Launch Vehicle: X-15. X-15 1- A-128 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 February 27 - Launch Vehicle: X-15. X-15 1- A-129 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 March 28 - Launch Vehicle: X-15. X-15 1- A-131 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 April 4 - Launch Vehicle: X-15. X-15 1- A-132 FAILURE: Failure. X-15A aborted launch. Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 May 23 - Launch Vehicle: X-15. X-15 1- A-135 FAILURE: Failure. Fixed Alpha Ball/WTR Test/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).

1968 July 15 - Launch Vehicle: X-15. X-15 1- A-137 FAILURE: Failure. Fluidic Probe/etc Test/Technology mission Agency: NASA/USAF. Apogee: 14 km (8 mi).