How do airlines link travellers who bought separate tickets?

Upvote:4

There could be multiple ways for them to track you down :

  1. The fact that you have booked at the same time.
  2. The fact that you have booked adjoining seats.
  3. Previous bookings. If you had booked together in the past.
  4. Was this flight operated by EgyptAir or by another company with a codeshare? If it was operated by another company, maybe you were the only ones using this codeshare with EgyptAir.
  5. Details on your passport. Maybe you have some details in common (place of birth, area where you live, etc...).

The intense questioning you have received might or might not be related to that. No one will be able to tell you for sure. Maybe if you had booked together, you wouldn't have had this intense questioning. Only the people who questioned you know the exact reasons why you were checked. Everything else will just be speculation. Checks critera aren't disclosed publicly.

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