It is said that the four major GDSs abroad are sabre, worldspan, galileo and amadeus. But I'm not sure what their relationship is,

At present, GDS commonly used by domestic air ticket agents are: 1E (airmail), 1B(ABACUS), 1A(AMADEUS) and 1G (Galileo). There is no obvious difference between the two. If there is any difference, it is that agents in different regions have different preferences.

There is not much difference in main technology. They are all distribution systems, which can distribute air tickets, hotels, car rentals, tourist visa applications in some countries, LCC (low-cost airlines) ticket sales and other products, as well as some middle-and back-office technology integration solutions.

Abacus belongs to SABRE, abacus is located in Xinjiapo area of Southeast Asia (belonging to regional GDS), SABRE is mainly located in North America, TOPAS is generally used by Korean agents, and AXESS and INFINI are used by Japanese agents.

Want to know the development history of GDS, I recommend you to refer to/link? URL = xd 5g 6 uscp 6 kofttgb 8 pajwcyxx a 3-nt 7 lzpm 3 ebx 9 _ ove 6 ot 6 xvbvdajxngo 15 rfgzxm 8 vz _ ybkrc 0-uvx KDC _ tzagrlz 5 jphwdfeh 0 de _ e