Originally Posted by
AllanJ
If you order stuff from the magazine in the seatback pocket and have it shipped to your home, then the airline is required to collect sales tax if it has an office or its headquarters or a ticket counter or other place of business in your state.
It is possible that some states (I don't know which) tax airfare, although travel between states and the taxable nature of that airfare is regulated by the federal government.
I believe that airplane parts delivered from the airline's own warehouse in another state are not subject to sales tax when installed in a plane sitting in a given airport but when the parts are purchased, sales tax of the state where the parts are picked up or delivered does apply.
Travel tips:
http://members.aol.com/ajaynejr/travel.htm
The OP was asking about
air travel -- NOT goods you purchase from the seatback pocket magazine, or airplane parts! (Oddly enough, as a longtime airline passenger, I have never yet had occasion to purchase airplane parts.

)
As I said, state sales taxes tend to be levied on goods, not on services. (A generalization which may, of course, have some nuances and exceptions.)