If I abused my staff travel perks in that manner, I would probably find my P45 waiting for me when I got back! Failing that, the ideal solution would be to cancel their concessions
while they are overseas... let them pay full fare to get home!
The worst offenders I know of (ie only the ones bad enough for the cabin crew to tell us about) have been family of staff; why they thought it acceptable to treat someone else's daughter in a way they would never treat their own escapes me.
