[Uberphallus]

Nope, they all use Amadeus, except for Scandinavian Airlines. Actually Lufthansa and Air France CREATED Amadeus to consolidate their GDS operations. They're now pissed because Amadeus takes a piece of the cake and plays weird pricing shenanigans, but they're still there.

Source: worked at Amadeus.

[BrandoElFollito]

This creation is also visible through the split between France (R&D in South of France) and Germany (datacenters and operations)