It's Easter, airlines don't work on public holidays!
I can only give you some info when my son applied for an apprenticeship at BMW. Applied March/April, did an online assesment, around June/July got invited to 2nd assesment at dealership. Shortly after invited for Interview, then after GCSE's finished was invited to dealership for 2 day practical. Got offer subject to GCSE results at end of July. Started in September.
No idea how many applied, but there were at least 12 at the 2nd assesment. It will take time, you really have to be patient. If you can't then a call to them just enquiring as to time scales without being pushy I would suggest.