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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 
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. 
 
 
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