Originally Posted by mahasamatman
It's worse than that. You get no online booking bonus if any leg of your itinerary is on non-UA metal.
This is absolutely correct and is worth emphasizing. I guess everyone has to learn this the hard way. I remember when I phoned up MP to request my 1000 miles booking bonus on a flight SFO-FRA on UA with FRA-MUC on LH. No dice.