Subsequently a team led by his chief draughtsman, Joe Smith, developed more powerful and capable variants to keep the Spitfire current as a front-line aircraft.

The design work and its construction was ended in the spring of 1944, when the aircraft manufacturer was forced to put all its efforts in repairing the front-line aircraft.

With this one the access was blown if anyone talked: any one of those people who knew that a front-line Soviet aircraft was parked here under wraps at Furstenfeldbruck.

The concept was similar to front-line aircraft used in the World War I, which was called the CL class in the German Empire.

First they flew Trainer aircraft, then transitioned to front-line aircraft.

The outbreak of war and the need to concentrate on front-line aircraft delayed production of the PM.1 but an order for 10 was placed in August 1942.

The 104 aircraft air fleet was considered obsolete with the front-line operational aircraft consisting of four Hurricanes Mkl's, one Blenheim bomber and one Fairey Battle.

Liaison pilots would train on L-3s before moving on to front-line aircraft like the Piper L-4 or the Stinson L-5.

But I can't see that what they hoped to win in propaganda points was worth one hundred forty of their front-line aircraft.

Hodgkinson also had a leading role in the development of modern front-line aircraft and equipment, most notably the Panavia Tornado.