Just chosen mine with the same intentions. Managed to get advice from quite alot of people (dropped a few emails to Flight Instructors, Flight Schools, University Admissions departments, Airline HR departments etc.)
Am doing GCSEs in:
Maths (possibility of Statistics also)
English Language
English Literature
Triple Science
Business Studies
German
ICT
RE
and AS Levels in:
Geography
Critical Thinking
Choosing options is not fun, but the advice I got was do things you enjoy, do things your good at and do things that are relevant. Good Luck!