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BA NDC is quite good, robust and reliable. Lot of functionalities such as seatmap, service list. reliable inventory, 99% fares coming through search is bookable at same price.
Few problems. 1. No queue system2. You have to develop all the after sales functions (Cancelling, amanding, repricing, reshoping, upgrading, date changes etc etc)
The NDC is actually quite good, but the reason no real agencies have signed up is that BAare happy to give you access to their 'test.xxx.xx.com' site, but ignore ALL requests to move from test to live.