Similar question. I booked flights from HNL-LAX on UA. I'm planning on nesting a LAX-LAS-LAX tkt on US. The LAS-LAX flight arrives in LAX an hour before the LAX-HNL flight.

First, can I ask that my bags be checked all the way through to HNL at the US counter in LAS?

Second, is an hour enough time for the baggage transfer between airlines?