The coroner at an inquest into a mid-air collision in which four people died said it was "highly unlikely" it would have happened had a warning system been in place.
Cousins Katie-Jo Davies, 14 and Nikkita Walters, 13, from Evanstown, Rhondda Cynon Taf, died in the Bridgend crash.
Instructors Hylton Price, from Bridgend, and Andrew Marsh, from Penarth, were also killed.
The RAF says it has now begun fitting collision systems to the cadet planes.
The inquest at Aberdare heard the planes did not see each other in time and collided in mid air during a training flight over the Kenfig Nature Reserve near Porthcawl on 11 February, 2009. - BBC
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