First, Congrats on the DE. I have several of them and use them periodically when I travel or when I am very pressed for time. Nice to have an alternative. I'd continue to try to learn to shave with a Str8, it can be very rewarding.

As far as a Str8 on an airplane is concerned, they are not permitted in the cabin/carry on luggage. You are permitted to have them in your checked luggage.