This was not the first crash involving a crew misreading this type of altimeter in this long distance, high altitude aircraft.

Traffic flow within the sector is mainly east/west and consists mostly of high altitude aircraft proceeding to and from overseas destinations.

There he led work on a space system and related "unconventional imaging" technology, including the flying of prototypes on low and high altitude aircraft.

In 60 test flights at Dayton, Ohio, the high altitude aircraft could only reach 295ft of altitude.

He had never seen a sputnik launched, never travelled in a high altitude aircraft.

They also disclosed that two other US air sampling efforts were being developed and outlined those approaches using special high altitude aircraft and sounding rockets.

Discrete frequencies are available for high altitude aircraft (at and above 18,000 feet MSL, or FL180), based on location.

Some modified single-seat high altitude aircraft were built with extended-span (57 ft 2 in or 17.43 m) upper wings supported by a pair of outward-leaning struts.

Interception of these high altitude aircraft was difficult, and none were lost on 15 September 1940.

Wing spans of 27 and 33 feet (8.2 and 10.1 m) were used for the high altitude aircraft.