I have been searching the forums and cannot seem to find the answers I need. A United business class one way flight from CUN-SLC at the time we want is 676 a piece. If I book it using the multi-city CUN-IAH-DEN-SLC it is only 550. If I book this what happens if one of our flights is delayed and we miss the connection? Will the airline book us on the next flight or are we on our own?? Thank you in advance for any help.