Properly, in this context, simply means tax it like you tax fuel/energy for other modes of transportation. Airlines have been very successful at getting specia

Properly, in this context, simply means tax it like you tax fuel/energy for other modes of transportation. Airlines have been very successful at getting special treatment by scaremongering "no more connections for you". Which is certainly a mostly empty threat, because connections will only go down by as much as demand elasticity reacts to the price difference.