The combination is subject to customary regulatory and other approvals, including merger controlclearances, and is expected to complete in the second half of 2013.
The FAA said the revocations cite several violations of regulations, including failure to comply with air traffic control and clearances and operating carelessly and recklessly.
Air-traffic controllers currently use traditional radio transmissions to issue taxi clearances, while pilots manually control planes and peer out cockpit windows to spot potential collision hazards.