ejection seat

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A seat fitted with an explosive charge and designed to eject the occupant clear of an aircraft during an in-flight emergency.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A seat in an aircraft which can be ejected from the cockpit and thus save the pilots life when a crash is imminent.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a pilot's seat in an airplane that can be forcibly ejected in the case of an emergency; then the pilot descends by parachute