I think you are highly unlikely to be successful with the RAF with those grades. If I were you, and I wished to continue an ambition to join and fly for the RAF, I would enrol in night college and retake those exams as soon as possible - aiming for Cs at the very minimum.
You will find that most sponsorship schemes, when looking at school-leavers, will also be unimpressed with results at your level. A few years down the line, when you have other life achievements to your name, A-level results will be less important. Right now, they're all you have - and, as you well know, they're not good enough for the career options you'd most like to adopt.
You must either retake and improve your results, or go and get a degree or professional qualification and thereby reduce the significance of your A-levels. As a brief read of this forum will show, you don't need A-levels for a self-sponsored modular or integrated frozen ATPL course - but you do need money!