Originally Posted by
MSPeconomist
HMMMM, I just paid DL $107 to upgrade a LHR-MSP nonstop ticket for summer. The ticket has been reissued and looks OK. This should be the additional luxury tax to go from coach to business class.
If you were upgrading a paid ticket, the economy-level APD had already been factored into the ticket price. What you paid was the
differential between the economy rate and the "standard" (i.e. premium cabin) rate.
http://en.wikipedia.org/wiki/Air_Passenger_Duty