I totally agree with v6, theres comes a point where you do have to say enough is enough and to carry on becomes self defeating. This aviation thing takes so much out of you in terms of money and commitment that it really hurts to think that enough is enough and it takes guts to think that.
Failing an interview (especially in this environment) feels like you've just been kicked in the nads, especially when I reckon alot of the time its not so much the person being interviewed that isnt good enough its just that for whatever reason you dont have a good interview.