While it is easy to see how airlines like the 2 engined airplanes on most routes, and flying directly instead of the spoke and the hub model, the question is, h

While it is easy to see how airlines like the 2 engined airplanes on most routes, and flying directly instead of the spoke and the hub model, the question is, how easy is it to grow? I just flew MUC-SFO and back. A nice direct flight operated by LHA once per day with an A 340. And both flights were booked to the last seat. While arriving at SFO on the way back I could see the LHA A380 leaving for FRA. So, with them operating a flight to Frankfurth with the A 380 already and the flight to Munich filled completely, what is the most economic way of growing? Is it to have two flights per day, or take a larger airplane? And probably, there are only so many more open slots at the airports for additional flights. Once they are saturated, having a much bigger airplane available could be a business perspective for Airbus. If global air travel continues to grow, we need either many more flights, or bigger airplanes. Especialls with the 747 going away, if Airbus can keep the A 380 alive, there might be quite a future.