[QUOTE=jrl767;34084442]28. (2001) There’s no easy way to get from Kona, Hawaii to Montreal, Quebec but on a positive note you’ve found an interesting routing involving three nonstop flights, each operated by a different airline with each utilizing an aircraft type built by a different manufacturer. Additionally, there’s one more similarity between each aircraft type that would not apply with any other trio of aircraft types possible between this city pair. Can you identify the route, the three airlines and the three aircraft types? The admiration of your peers will rise inestimably should you also be able to acknowledge the unidentified similarity between each aircraft type.

Okay then: we've established KOA-HNL was a Hawaiian Airlines 717, and we're now looking for HNL-XXX-YUL on two different airlines operating jets from two different manufacturers. Props to my USAF bud ATOBTTR for the guess about the powerplants

HNL-Atlanta/ATL Delta L-1011-500
ATL-YUL, AC 320

All powered by engines manufactured by Rolls-Royce (or a consortium of which R-R was a principal)

Now we're getting there! The common thread is indeed all aircraft being powered by Rolls-Royce (or a consortium of which R-R was a principal). The L-1011-500 was also one of the aircraft but Delta, ATL, AC and the A320 have no relevance to this particular answer.

Should be pretty near tap-in now...