Actually, the problem lies with the departure times of the HNL-MNL (HA 455) and HNL-SYD (HA 451) flights. Most of HA's westbound flights from the continental U.S. require an overnight stay in HNL if one's final destination is MNL or SYD. If the HNL-MNL flight departed at 2:30PM (instead of 12:30PM) and the HNL-SYD flight departed at 2:05PM (instead of 11:50AM), an overnight stay at HNL wouldn't be required for most of the customers going on to those destinations.

Here's a list of the usual arrival times for HA's westbound flights from the continental U.S. to HNL...

HA 17 LAS-HNL 5:00AM
HA 47 OAK-HNL 12:00PM
HA 35 PHX-HNL 11:25AM
HA 11 SFO-HNL 11:30AM
HA 1 LAX-HNL 11:35AM
HA 19 SMF-HNL 11:40AM
HA 43 SJC-HNL 11:50AM
HA 7 LAS-HNL 12:05PM
HA 21 SEA-HNL 12:20PM
HA 15 SAN-HNL 12:55PM
HA 25 PDX-HNL 1:05PM
HA 9 LAX-HNL 8:35PM

If any HA flights from the continental U.S. need to leave earlier, its HA 15 (SAN-HNL) and HA 25 (PDX-HNL).

Here's a list of the usual departure times for HA's westbound international flights...

HA 451 HNL-SYD 11:50AM
HA 455 HNL-MNL 12:30PM
HA 449 HNL-KIX 1:50PM
HA 459 HNL-ICN 2:10PM
HA 481 HNL-PPT 4:40PM
HA 465 HNL-PPG 4:55PM
HA 457 HNL-HND 6:35PM

If HA 15 leaves SAN at 9:05AM (instead of 10:05AM) and HA 25 leaves PDX at 9:15AM (instead of 10:15AM), those passengers would have enough time to catch HA 449 (HNL-KIX).

Thus, if HA 451 and 455 leave HNL a couple of hours later and HA 15 and 25 leave SAN and PDX an hour earlier, required overnight stays in HNL for most of HA's westbound passengers arriving from the continental U.S. would be eliminated. In addition, HA could lay off Andrew Watterson (just in case he's following this thread) -- I'm willing do his job for flight benefits, stock options, and a salary of $1 per year.