Travelport and Sabre have made their feelings very clear in recent weeks over the battle between American Airlines and online travel agencies - and now Amadeus has finally waded in.
The Madrid-based GDS watched on the sidelines as Travelport attempted to block American Airlines from withdrawing its fare from Orbitz - a move which eventually failed.
It also kept quiet when Expedia retaliated a few days later and first de-preferenced AA fares and then axed them completely.
But with Sabre breaking cover this week and hitting American Airlines as well by ending its contract with the airline ahead of schedule, Amadeus would eventually have to clarify its position.
Sticking to the usual mantra of declining to comment on specific "business matters or negotiations" involving other companies, Amadeus says it is "carefully considering the recent market announcements".
But, in a statement from an official, Amadeus confirms that it is now "actively reviewing" its US airline content agreements.
"Should any development occur that breaches these agreements, Amadeus will take the actions we feel appropriate and in the best interest of our customers and our business."
The GDS also has criticised the Direct Connect model at the centre of the recent all-out war between American Airlines, Orbitz, Expedia and its fellow GDSs.
The official says:
"The Direct Connect model only promotes fragmentation, raises costs, and creates inefficiencies across the travel industry distribution chain. And for travelers, a direct connect approach will result in higher fares, fewer options, and the elimination of true transparency in their air travel."
The statement from Amadeus effectively puts American Airlines in the firing line of each of the major GDSs on the planet, albeit with different degrees of severity and focus.
Amadeus says it is committed to working with all carriers and plans to do so in the future.
But the over-riding message is the same from each - defend the model to the hilt as pressure grows on the GDSs from carriers to change the way they reach out to intermediaries.
"The global distribution systems continue to be unmatched as the most efficient, proven means of distribution between airlines and travel agents to travelers. GDSs are the best and most effective aggregators of content to the benefit of travel agents in terms of costs, efficiency and reliability. GDSs also provide the most transparent, comprehensive choice and comparison of airlines’ travel options to consumers."