I recently found myself buying a pair of tickets from Kona to Kapalua. AA.com (who I find have the easiest-to-use all-airlines schedule) found me a nonstop with an Aloha Air flightcode for $121 each, plus $5.70 in taxes. AlohaAir.com had the same total price, but claimed that $14.14 of it was tax. Expedia and Travelocity (the latter of whom win the prize for slowest web search) agreed with Aloha about how much was tax, and added a $5 per ticket "booking fee". So far, so straightforward, so much for the online travel agents. But what AA.com didn't reveal is that the flight isn't operated by Aloha, it's operated by Island Air. Buying an Island Air-designated ticket on the same flight on Travelocity lowered the total price to $94.93 each. On Expedia, it was $85.00. And on IslandAir.com, it was $64.27! And the frequent flyer miles are United miles either way.