I'm trying to learn how to use the award availability tool. As an exercise I want to find out if it's possible to fly from NYC to LON with a stopover in HKG. This seems like it would be possible from what I understand of United's award routing rules. But EF only allows searching one way award availability. Additionally I want to find out if I can do NYC-LON(Stop)-HKG-SFO. There doesn't seem to be a tool designed for answering these types of queries