@vandrew4
No, don't fly. as soon as we leave the EU I should imagine the French and Germans will be shooting surface to air missiles at any passing British plane.
You realise that the British planes won't be flying anywhere - on 29th March, they are no longer certified or insured to fly anywhere, and nor are the pilots and crew. Unless some sort of deal is put in place.
And here the UK hits a problem.
UK: Brexit means Brexit; Leave means Leave;
EU: Fine, off you go, but your planes cannot land at our airports; your food cannot be exported to us; your lorries and coaches (and their drivers) cannot use our roads; your citizens can no longer travel freely to our countries. You cannot have the same rights as a non-member that you enjoyed as a member.
UK: Oh come on, surely we can do a side-deal on flights?
EU: No - Leave means Leave
UK: And transport and travel?
EU: No, you've decided to leave.
UK: And food, drink, chemicals...?
EU : No - that would be cherry picking. You have used your sovereign right to decide to leave. Once you've left we can spend the next 7 years negotiating a new Agreement, just like we do with any other non-member.