USAir and American reservation systems are being merged this weekend. We have been on the line with American trying to make mileage reservations that the system shows but will not confirm. Reservations is having the same problem. They are going to book us on everything except the last leg and enter a star file so that we can call later and have it inserted free of charge. This might be a good time to book when flights at lower levels are showing as available, even if you have to also call in later for connections.