The old "T-card" check-in system was primitive but effective. Teesside ladies could check someone in inside 30 seconds. Then came DCS....
I'm still pretty sure that the "nines" had an extra row stuck in when I was there, taking them to 90.
On the subject of checking in for the wrong type, Midland handled Dan Air at Teesside, and once assigned pax for a B11 NCL-MME-AMS, to discover on the DEP message from NCL that it was a 146. A scrum on board ensued at 0715.