British Airways has signed a three year full, global content deal with Galileo.
The deal with the UK and Ireland's largest GDS was hammered out after weeks of negotiations.
It comes into force on April 10 and BA content will be available to all Galileo agents signed up for its "opt-in" scheme.
This scheme includes the availability of fares which are publicly available through other channels, including the airline's own website, ba.com.
Tiffany Hall, BA's head of marketing and distribution, said: "We have been working with the GDSs for some time as our previous contracts expired at the end of February.
"We are very pleased to have reached an agreement with Galileo, which will reduce the airline's distribution costs and ensures that our lowest fares can continue to be distributed to all Galileo travel agents."
Matthew Hall, Galileo's vp supplier services EMEA, said: "We are pleased to be the first GDS to achieve a new, guaranteed full content agreement with British Airways.
"This agreement further illustrates our ability to work with airlines to reach a situation that is mutually beneficial for both parties and offers great value to travel agents."
But the US publication Business Travel News quoted Robin Hayes, BA's executive vp of the Americas, as saying that the carrier was likely bring in a surcharge if deals with the other GDSs were not signed.
"At the moment, we haven't passed through the cost," Mr Hayes said. "We have said in the U.K. that from April 10, if agents haven't signed up, there will be a surcharge."
Ms Hall said that talks with Sabre, Worldspan and Amadeus were continuing.
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