Is it still "legal" on UA to fly into one city and out of another? i seemed to have gotten some flack from some members here that one of my itenaries was deemed "illegal" because i flew ORD --> HKG --> (own flight) --> PVG --> ORD.

I'd like to do something like ORD --> FRA --> (own transportation) AMS --> ORD. In the past, I've been able to do this by calling an agent and having them book this for me.

Any problems doing this going forward?