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The remaining two are Airbus test planes.
The new circuit breaker has not yet been flown in test planes, however.
Eighteen are in various stages of production, and four test planes are flying.
The crack occurred on a test plane at Edwards Air Force Base in California.
A small crowd of Army brass and manufacturing executives watched as the Model 299 test plane taxied onto the runway.
The frequent sonic booms of test planes breaking the sound barrier overhead are music to his ears, he said.
Even if the fire had not occurred on the test plane, "there would still be another delay," he said.
GE Aviation said the test plane would be configured with one of its CF6 engines, which would not require any modifications to burn biofuel.
The test plane broke the sound barrier on a two-and-a-half-hour flight over the Atlantic, but did not reach its Mach 2 cruising speed.
Instead of Pan Am flights to the moon we've got the faltering efforts of Virgin Galactic, which suffered another setback with the crash of its test plane last week.
There's a Peter Arno cartoon from the early forties that shows, in the background, some kind of military test plane crashed into the ground.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com