Booked a round trip rewards internatinal ticket (saver) to assian on United.com with multiple segments.The fare class on all my segments are I or O except one segment from ORD to LGA with X. I think I can call UA to get rebooked to the first class on that ORD-LGA flight when the saver award availble. I am wondering if I can ask UA to put me on the waitinglist. So I do not need to check the availability again and again on there website. By the way, do I have to pay for that 75dollar booking fee if I saw the saver award availabe within 21 days from my trip. Thanks!