Example https://www.momondo.de/flight-search/BOS-MAD/2021-06-26/2021-07-02/business?sort=bestflight_a
Boston <-> Madrid, business, Jun 26 to Jul 2. On Momondo.de this yields a few budget OTAs (Online Travel Agency) for as low as $603. Price on TAP Portugal (the airline) is close to $2600. So the OTA price is less than a quarter of the airline price.
I'm aware that some OTAs can be shady or even outright scammers, but I found this fare to be bookable on some of the better ones, for example Priceline. I had good experience with Priceline before: In fact, they provided a much better Covid refund experience than, for example, Air France did.
What's also weird about this one is that it sometimes doesn't show up at all and I have to repeat the same search. Also the cast of OTAs seems to vary and also the price seems to fluctuate a bit from search to search.
These fares do not show up on ITA Matrix. On skyscanner it does show up but only with an outfit named gate1.nl which I have never heard of.
Specific questions:
- What can I do to determine whether this is a real deal or not?
- Why do price, OTAs and overall availability fluctuate from search to search ?
- How is it possible that on OTA can offer the same flight at a quarter of the price?
So if anyone has an idea what's going on here, I'd be interested to learn more.