@Anonymous I'm not a techie, but "Flexible location search"?
I once made airline reservations for myself and my partner's 5 year old son for a vacation from Canada to Guatemala. Being about 23 years old at the time, and not very savvy about such things, I had neglected to check the travel requirements and the 5 year old didn't have a passport, just a birth certificate. Not adequate for a trip to Guatemala. And there we were in the airport with our bags.
So I asked the airline where else warm and tropical they flew that wouldn't require a passport. We flew to St. Lucia instead, on the spot travel change. Had a great time.