Sabre Travel Network has assigned a "multi-year" full content deal with KLM.
The agreement will give the GDS's agents in Europe access to the carrier's entire range of published fares and inventory.
Sabre said the new agreement was in addition to KLM's existing global participation with Sabre.
The GDS said the deal covered its online agencies in Europe, including Travelocity in the UK and Germany, last.minute.com and the Scandinavian website Resfeber.
These plus users of Sabre's GetThere tool would have access to all KLM fares including those on its website.
Richard Adams, Sabre's senior vp EMEA, said: "We are delighted to sign this agreement with KLM, securing enhanced content for our travel agency customers."
Bart Vos, KLM's vp e-commerce and distribution, said: "We view Sabre not just as a GDS operator, but as a key business partner who can add value to our product distribution globally and, very specifically, right here in Europe."
GTMC warns on corporate social responsibility
Companies which push employees too hard are risking serious legal penalties, the UK Guild of Travel Management Companies (GTMC) said.
It said the police and courts were taking "an increasingly tough line" on companies whose employees cite work pressures as a factor in any road accidents.
"Someone who falls asleep at the wheel after a lengthy business trip can claim that company demands impaired his or her ability to drive safely," GTMC ceo Philip Carlisle said.
"In the event of an accident, employers could be held to be partly culpable – and that could lead to civil action or even criminal prosecution."
He said corporate social responsibility (CSR) was fast becoming "a major issue" for business travellers.
"The business traveller flying in from Singapore or San Francisco has usually enjoyed a fairly restful flight and, providing he or she has watched the alcohol consumption, should be perfectly fit to drive,” Mr Carlisle said.
"It is the poor soul who has to trek from Leeds to Liverpool, Manchester to Milton Keynes, and then back again, who is most at risk.
"Companies who insist on saving a few pounds on overnight accommodation could end up facing legal bills running into thousands – and more.”
"Accidents do happen, but if employers and employees alike take reasonable, sensible precautions, many of them could be avoided.
"If it's a choice between the cost of a single night's hotel accommodation and the cost of a tragedy, it's a no-brainer.
"Corporate social responsibility, in the end, is nothing more than common sense."