Caveat emptor! These people are going through a lot of trouble to hide their identity. The address on their website does NOT match their Chamber of Commerce (Kamer van Koophandel) entry. This is from the Kvk website: (kvk.nl)
Airline Pilot Service B.V.
- KVK 67865488
- Vestigingsnr. 000036358371
- Friesestraatweg 175
- 9743AB
- Groningen
67865488 0000 000036358371 Airline Pilot Service B.V.
Friesestraatweg 175 9743AB Groningen Organisatie-adviesbureaus Uitzendbureaus Payrolling
...
Checking their given address (on their own website), gives a different company that seems completely unrelated. Their phone number starts with (0)88. This is not uncommon for companies in The Netherlands, but does not identify the location, because it's not an area code.
Using google on the phone number returns this:
https://www.google.com/search?q=0882...w=1396&bih=772
the first result gives a few vacancies in yet another location and refers to this website:
https://www.vacatures-try-act.nl/vac...ampaign=Indeed
It seems like a pay-to-fly program. But given the red flags I'd be very very reluctant to contact these people.