The decline of Worldspan on the world stage has been fairly sharp over the past few years. As part of the disclosure of the AA vs Travelport battle - I looked at the number of markets where Travelport was going to charge AA the premium fee. AS part of that disclosure we are able to see which markets have which GDS.
Here is the list:
While Worldspan was never that large on the International Stage - the number of markets where they were present has dropped by more than 50% in a few years.