I work 8-5, so yes, I realize apple is open during these hours. I know they are open until roughly 6 or 7pm. It's the after 5pm hours, and sat/sun hours I'm interested in. So I can plan my week.
An air gap for a dishwasher is a requirement set forth by local plumbing codes. It is a device designed to ensure water flows only in the right direction during the dishwasher cycle. As a dishwasher operates, hot water flows in from the sink's hot water connection.
If you drain the condensate into the sewar system, there needs to be an air gap. A trap isn't an air gap. You can run the condensate into a condensate pump and run that line into the sewer line, as that would be an air gap, but it's not wise to go directly from the coil to the waste line. As for the question of why the trap.