X-15 Index - Missions

Highest flights

The FAI set the limit of space at 100 kilometers (62.1 mi). But in the 1960s, the USAF considered an altitude of 50 miles (80 km) (80.5 km) as the limit of space; USAF and NASA pilots and crew exceeding that altitude at that time could be awarded the Astronaut badge. Thirteen X-15 flights went higher than 50 miles (80 km) and two of these reached over 100 kilometers.

14-Oct-65

01-Nov-66

17-Oct-67

15-Nov-67

21-Aug-68

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HIGHEST FLIGHTS

Flight

Date

Top Speed

Altitude

Pilot

Robert M White

59.6 miles (95.9 km)

3,831 mph (6,165 km/h)

17-Jul-62

Flight 62

Flight 77

17-Jan-63

Flight 87

Flight 90

Flight 91

Flight 138

Flight 143

Flight 150

Flight 153

Flight 174

Flight 190

Flight 191

Flight 197

21-Aug-68

15-Nov-67

17-Oct-67

01-Nov-66

14-Oct-65

28-Sep-65

10-Aug-65

29-Jun-65

22-Aug-63

19-Jul-63

27-Jun-63

3,677 mph (5,918 km/h)

3,425 mph (5,512 km/h)

3,710 mph (5,970 km/h)

3,794 mph (6,106 km/h)

3,431 mph (5,522 km/h)

3,549 mph (5,712 km/h)

3,731 mph (6,004 km/h)

3,554 mph (5,720 km/h)

3,750 mph (6,040 km/h)

3,856 mph (6,206 km/h)

3,569 mph (5,744 km/h)

3,443 mph (5,541 km/h)

51.4 miles (82.7 km)

53.9 miles (86.7 km)

65.8 miles (105.9 km

67.0 miles (107.8 km)

53.1 miles (85.5 km)

51.3 miles (82.6 km)

55.9 miles (90.0 km)

50.4 miles (81.1 km)

58.1 miles (93.5 km)

53.1 miles (85.5 km)

50.3 miles (81.0 km)

50.6 miles (81.4 km)

William H. Dana

Michael J. Adams     ✝

William 'Pete' Knight

William H. Dana

Joe H. Engle

John B. McKay

Joe H. Engle

Joe H. Engle

Joseph A. Walker

Joseph A. Walker

Robert Rushworth

Joe Walker

Fatal ✝

Flight

Date

Top Speed

Altitude

Pilot

Flight 97

Flight 89

Flight 86

Flight 64

Flight 59

Flight 45

Flight 188

Flight 175

Flight 137

Flight 105

5-Dec-63

18-Jul-63

25-Jun-63

26-Jul-62

27-Jun-62

09-Nov-61

03-Oct-67

18-Nov-66

22-Jun-65

29-Apr-64

4,017 mph (6,465 km/h)

3,925 mph (6,317 km/h)

3,910 mph (6,290 km/h)

3,989 mph (6,420 km/h)

4,104 mph (6,605 km/h)

3,938 mph (6,338 km/h)

3,905 mph (6,284 km/h)

29.5 miles (47.5 km)

19.2 miles (30.9 km)

Robert Rushworth

John B. McKay

William 'Pete' Knight

William 'Pete' Knight

Robert M. White

Joseph A. Walker

23.4 miles (37.7 km)

18.7 miles (30.1 km)

21.7 miles (34.9 km)

19.8 miles (31.9 km

19.1 miles (30.7 km)

Robert Rushworth

Robert Rushworth

Joseph A. Walker

* Neil Armstrong

* First Man on the Moon

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