Formed in 1987 by Europe-based airlines to combat the dominance of US-based providers of information technology, Amadeus has become the world’s largest provider of IT and related services to airlines. Since 2010, the company has also served customers in the hospitality, airport and online travel agency industries.  It has customers in 190 markets. Revenue was $4.81 billion in 2022.

Handling reservation systems for airlines and hotels requires Amadeus to aggregate payments and operate a gateway to acquirers o...