In addition to the 4 commuter hotels a month and hotels in base for lost flying, you can also get a company paid hotel for picking up OT, if the OT sequence is non-commutable, and it does not count toward the 4 a month. To answer your other question, as others have said, ORD and DFW are our only current bases that you can go to, as MIA has closed, and NY is set to close. But, like others have said, MIA should become a satellite base soon, and rumors of a possible NY satellite base in the future.