However, the loss of four large fleet carriers, and over 40% of the carriers' highly trained aircraft mechanics and technicians, plus the essential flight-deck crews and armorers, and the loss of organizational knowledge embodied by such highly trained crew, were heavy blows to the Japanese carrier fleet.
To think about how the world has been pared down to a most essential fight or flight sensibility.
Radar is essential for flight, in ground and air traffic control, plus on-board weather detection.
While the plane can fly on one engine, an engine that broke up could destroy the hydraulic systems, which are essential to flight.
The computers involved today are not essential to flight, said the Federal Aviation Administration, but the airline decided not to take off until they were functional.
While both aforementioned techniques are essential for flight, it is critical to investigate how an animal balances the two to achieve aerial locomotion.
Officials of the National Transportation Safety Board are not close to declaring that the loss of the fin, a 27-foot-high structure that is essential to flight, was the cause of the crash, or even the first part to leave the jetliner, an Airbus A300, in its puzzling in-flight breakup.
The bladed, quill-like feathers of modern birds are essential for flight, and over millions of years they have become highly specialized for this purpose.
All but essential civilian flights in the Moscow and St .Petersburg regions were canceled and the air force took additional measures to shield both cities, said Aleksandr Drobyshevsky, an air force spokesman.
