Thanks for writing to H.C.M. for your query.
I have gone through your query regarding risk of rupture of ear drum in air travel. as you hve single working ear, and that is also an operated ear.
Here I would like to tell you that in air travel there are chances of eustachian tube obstruction leading to blockade of ear, though this can be managed by-
(1) Frequent swallowing of own saliva, as swallowing opens the eustachian tube.
(2) If blockade does not relieved by swallowing than blowing the nose against pinched nostril
(3) If above two failed than few medicines may be taken and ultimately myringotomy
will open it.
Considering above facts prior to flight you should exmined by ENT specialist
for treatment of any infection in throat which may aggravate the obstruction of eustachian tube. During travel you should take proper precaution.