An antitrust investigation into contracts between airlines and Sabre and Amadeus has been pulled by European regulators.
The European Commission unveiled a formal review into agreements between airlines and two of the air industry's global distribution systems in November 2018.
The regulator had concerns that terms in the pair's ticketing contracts with carriers and intermediaries might breach competition rules.
A "thorough analysis" since has led the investigators to conclude that there is insufficient evdience to pursue the inquiry, a statement from the EC says.
However, closure of the investigation does not mean the "agreements in question comply the EU competition rules," it adds.
An review of the European Code Of Conduct for the sale of tickets and the relationship between agencies, airlines and GDSs is ongoing.
And the commission will continue to "monitor developments in the airline ticket distibutuon sector."
An Amadeus official says the company welcomes the decision to halt the probe, adding: "Amadeus has worked closely with the Commission in an open and transparent manner since the launch of its investigation in 2018 and will continue to do so in light of the forthcoming regulatory review of the EU Code of Conduct for CRSs.
"Amadeus stands for fairness and neutrality in airline distribution, providing non-discriminatory and neutral market access for airlines, and choice for consumers and travel buyers.
"In today's uncertain COVID-19 context, when a sustainable recovery is at stake, this neutral marketplace is more crucial than ever."
A Sabre official adds: "We are pleased that the EC has closed its investigation. We are not commenting any further on this matter."