Is it possible to add "airborne at" +(minutes past the hour) as part of the phrase the tower uses to hand an a/c over to approach after take off?
It would be say "Speedbird 344 airborne at 25(two fife) contact approach on 120 decimal 5"
This plus the saying of QNH and QFE should at least be for a future apgrade. I'm sure it could
be possible to isolate sounds to resemble the letters closely.
Good idea, but I'd say it's waaaaay far down the priority list. It is certainly not something you hear each and every time at all airports, so it should be random to say the least. Besides, as with many other similar requests, "airborne at" is not part of the current voice pack so it would need to be re-recorded or manually created "editvoicepack" style for all voice sets! A lot of work, believe me
I like the QNH idea much better, but even that is just icing on the cake.