1) Fit to fly 2) Of aircraft 3) Ready to take off 
Describes an aircraft which meets all relevant statutory requirements of the registering country and any other required to give authority to its operation. See also Certificate of Airworthiness.
[adj] - of aircraft
A term used to denote that an aeroplane has been examined and passed as safe for flying.
adjective of aircraft; fit to fly
(of an aircraft) meeting established standards for safe flight; equipped and maintained in condition to fly.