Sabre has filed a revenue increase of 6% in the first quarter of 2019, giving it $1.49 billion, but against a backdrop of declines on other key metrics.
Adjusted EBITDA was down 13% at $262 million from the first quarter of 2018 to the same period in 2019.
The company's operating income was also down by some 33% to $110 million from $165 million.
Sabre says costs have been incurred through a range of activities, including a cloud migration project and other tech-related initiatives.
Other outgoings to have hit the bottom line have come via operating expenses in the Travel Network division.
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The unit - covering global distribution system-related operations - saw its revenues increase by 7% to $774 million between Q1 2018 and 2019.
The number of air bookings climbed by 2.9% to 139 million.
The Airline Solutions division increased revenues by 3.1% but took the brunt of the decline in operating income, with a 50% drop to $15 million.
Revenue generated by Hospitality Solutions increased by 7% to $73 million over the same reporting period.
The company has revised its 2019 forecast as a result of the grounding of the Boeing 737 MAX aircraft at two of its customers and the suspension of flights at Jet Airways.
It expects to reach a revenue target in the region of $3.965 billion to $4.045 billion for the full year.
Chief financial officer Doug Barnett says: "Although we have observed a modest slowdown in global GDS industry bookings, our expectations for continued share gain and our regional and customer mix give us confidence in the underlying performance of the business.
Sean Menke, Sabre president and CEO, adds: "We are unlocking savings that fund investment to deliver new innovations that we believe will help advance the marketplace and drive future growth.
"We believe our strategy, technology transformation and customer engagement will lead to strong, long-term free cash flow generation."