Tell your dad that you'll get him cheap flights for life when you're qualified...
You should be able to get some weekend work in a bar or petrol station.
The other option is to sit tight, get another part time job in the evenings (at least that'll get you away from your moaning dad!), and go to ATA a few months later with some more savings in your back pocket. Also you might want to try a HSBC load in addition to the Career development loan.
Keep yer chin up - lots of people have been through it...