Possibly, but we would need a legal expert (which I am certainly not) to advise what features would be required for the aeroplane to "qualify" as a non-Gibratar jurisdiction for arrest purposes.
To be honest it just sounds like a willy-waviung contest between civil and military authorities. If so the owners of the waving willies (on both sides) should be sent to bed with no supper and the matter should be quietly laid to rest IMHO.
PDR