Used by pilots learning skills as check on course settings sometimes.
A work slowdown by pilots of other airlines had little effect.
The decision, which does not apply to violations by commercial pilots, was made on Monday after months of review.
Quick action by experienced pilots in both cases prevented catastrophe.
The figures are chosen by either teams or pilots, each submitting a single figure.
The acceptance or rejection of the pact by United's 10,000 pilots will be critical, labor officials said.
The agreement is subject to ratification by pilots and approval of the bankruptcy court.
The rest, unless flown by instrument-rated pilots, had to stay put.
It is affectionately called "the shed" by pilots and crew.
These were commonly known as the "Great Circle" by pilots.