Originally Posted by
richarddd
If UA cancels a flight can you choose any Star Alliance alternative rather than being limited to UA?
No. You can ask, but they can say no, and often will.
Originally Posted by
richarddd
Will the app show all reasonable available alternatives or can you try to construct some connection? If the later, would you have to call?
The app is quite good, but if you want something that doesn’t appear, you’d have to call.
Originally Posted by
richarddd
If the best alternative is a flight a some number of days later will they let you move the return a corresponding number of days?
Generally, yes, you would be able to move the return the same number of days.