Originally Posted by
xliioper
FWIW, the 4 hour connection limit for stopovers is for US48 domestic fares only. Now that companion certs can be applied outside of these, it can potentially vary. In particular, currently, HNL fares allow up to 6 hours before a stopover occurs, Mexico/Central America/Caribbean fares allow up to 12 hours (except for US territories where it is 6), and Alaska fares allow up to 24 hours. Note that there are some cases where connections are less than the stopover limit, but DL will fare out separate fares on segments (broken fares). These are effectively multi-city bookings and not allowed by cert terms.
Yeah, I used a companion cert to HNL last month and we had a 5-hour layover at LAX. However, that was a rebooked routing after our original booking had a schedule change (and I used a phone agent to rebook), I'm not sure if that particular routing was available originally through the website or not (my guess is that what agents will actually do and what the IT system thinks is legal may have a wide discrepancy).