It certainly is. I worked on one of the first web flight booking systems. They ran over X.25 too, but you could run a very large office of agents over a single

It certainly is. I worked on one of the first web flight booking systems. They ran over X.25 too, but you could run a very large office of agents over a single 64K X.25 link. They were back ended by mainframes, which had page-based displays.