Amadeus is the most profitable of the three and has been posting the highest revenue growth rates. By its measure of booking volume, it's setting the pace, and by its measure of travel agency air booking market share, it's the largest and growing (up to 39.9 percent in the first quarter). Within Sabre Travel Network, first-quarter direct billable bookings increased 4.4 percent year over year, and Sabre claimed its "booking share" improved marginally to 35.4 percent. CFO Rick Simonson said the company expects Travel Network booking growth between 2.5 percent and 3 percent for full-year 2014. Travelport's number of segments processed during the first quarter increased 2 percent year over year after a 1 percent increase during 2013. Its market share, though, appears to lag Amadeus and Sabre. Travelport has been growing "beyond air" activities, including those related to hospitality and payment. Get the full story at Business Travel News