Would it be possible for you to try to be as "empty"as you are able before travel? Of course time aboard and whatever condition you have may mean that this would make little difference. Either way, good luck - an aeroplane is no great place to be with toilet problems of any description.
Last edited by TLDNMCL; 31st May 2017 at 22:42.
Reason: Spelling correction (old bloke, new gadget).