4 Conclusion and Outlook
We have presented a model to optimize a competitor’s booking limits when it facescompetition from an alliance partner. Both, horizontal and vertical competition was con-sidered. In horizontal competition the competitors offer parallel and substitutable prod-ucts and thus compete directly for customers, while in vertical competition the partnersoperate connecting, adjacent flights and one airline might sell tickets for products occu-pying the partner’s aircraft. Here, a capacity competition arises because customers forthe code shared products and local customers must be seated in the same plane. We dis-tinguished the code shared products after their origin and destination into inbound andoutbound products. Assuming that the code shared products generated the same revenuelike the corresponding local products, we were able to reduce the number of decisionvariables for the inbound code shared products.