Queueing theory
So you know how you’re waiting for your flight to board, and they call for zone 1 passengers only, and everyone ignores the zones and lines up anyway? I was totally amazed when that didn’t happen in Ottawa. They called for zone 1, and a few people stood up and boarded. Same thing for zone 2, 3, and 4. Everyone respected the zone boarding system! I don’t think I’ve ever see that happen.
On the other hand, boarding in Chicago and Istanbul for flights on Turkish Air were the total opposite. Everyone crowded the gate and passengers with small children couldn’t even get through. Turkish doesn’t use zones, and the waiting areas were not well organized for queueing. It makes you appreciate a well-organized lineup!