Wahey! You really are similar to me FlyFreeWbe! I'm going to do Geography as a choice for AS/A-Level. Firstly because I like it, secondly because I'm good at it and lastly because it will help a little for pilots etc.
This is because we study weather! I know its not that detailed compared with the full Met course but everything helps!
I'd therefore say Geog as French may not help you so much for a pilot except when you fly to France etc. But, GCSE French should help you enough with the R/T.
Having said all that, you should choose what you feel you enjoy the most and will do best at in both.
Hope it helps!