generally late august to mid october. prices rise sharply in the last three to four weeks before the holiday as the cheaper fare buckets sell out. the exact bottom varies by route, which is why watching one route beats following a rule.

the alert is a text instead of an email, you set it up by saying it in a sentence, and folk is the same assistant handling the rest of your trip. less a price tool, more a friend who happens to be watching.

folk sends you the fare and the link so you book on the airline yourself. you keep control of the payment.

several at once, and you add or drop them by just saying so. the free tier covers normal use.