We study bargained input prices where up and downstream firms can choose alternative vertical partners. We apply our model to bargained airport landing fees where a number of interesting policy questions have arisen. For example, what is the impact of joint ownership of airports? Does airline countervailing power stop airports raising fees? Should airports be prohibited, as an EU directive intends, from charging differential prices to airlines? Our major findings are (a) an increase in upstream concentration or in the substitutability between airports always increases the landing fee; (b) the effect of countervailing power, via an increase in downstream concentration, depends on the competition regime between airlines and whether airports can price discriminate: airline concentration reduces the landing fee when downstream competition is in quantities, but if downstream competition is in prices only where airports cannot discriminate. Furthermore, only in a specific case (Bertrand competition, uniform landing fees and undifferentiated goods) will lower fees pass through to consumers. (c) With Cournot competition, uniform landing fees are always higher than discriminatory fees, while the reverse is true with Bertrand competition. We also look at the incentives for airport expansion which raise quantities of passengers paying a given landing fee, but alters the nature of airline competition, which changes the landing fee.