I wouldnīt bother pestering them if I were you. If the scheme is running this year, which I donīt know, they will advertise August time I would have thought. Incidentally, the minimum age last year was 21. Other than the final stage interviews, all the initial selection process and advertising etc. is done by BAE Systems who have the training contract.
Iīd also hope that your emails to Airtours had better spelling and grammar that you have displayed in the above post.
Good luck
LOC