The Aloha Airlines 737 failed due in part to the bonding between 2 metal surfaces. It was a "cold bond" process that has been discontinued since it allowed moisture in between the surfaces. The high cycle time is due to the relatively short flights between islands in Hawaii. Honolulu Maui or Kauai is about 21 minutes. Long flights (Honolulu-Hilo) maybe 35 minutes.
The Ual flight was headed for Auckland and the fwd cargo door opened inflight and tore a hole in the first class cabin which sucked out 9 passengers and caused fod damage to the #3 and 4 engines.