Import calendar entries from Kayak calendar
Kayak offers a similar service to Tripit for sending them booking confirmation emails and having them added to a calendar which is available as a calendar feed.
Sometimes Kayak can recognize email formats that Tripit cant (and vice versa) so it would be nice if Planapple would accept any calendar feed as an import source for itinerary entries
It looks like Kayak calendar feeds don't include timezone info, so unfortunately this isn't quite as simple as just allowing Kayak urls.
TripIt feeds have the same issue. Planapple has a bunch of custom code that tries to intuit the correct timezones for a TripIt feed from things like airport IDs. So we'd have to do something similar with Kayak (but customized for them).
The alternative is having the synced items show up in "UTC time" in Planapple's itinerary (that's how Kayak and TripIt give us the info). However, that seems to cause more confusion than it solves.