tbf, you'd need a lot of time on your hands to do what the OP did with a paper guide. If you just want to know 'can I go to Paris and Brussels and back to Venice again in three flights' you can do that with three queries on Ryanair's website, which is actually less painful than battling through the upsell screens you'll be greeted with when you come to buy the tickets, never mind booking with their callcentre in the nineties...
And if you wanted to analyse large numbers of routes for business purposes then back in the nineties, you'd have probably found it easier to buy OAG's analyser tool or an airline spreadsheet file than digitise thousands of route pairs from a paper timetable, which you can still do if you don't want to write a scraper.
And if you wanted to analyse large numbers of routes for business purposes then back in the nineties, you'd have probably found it easier to buy OAG's analyser tool or an airline spreadsheet file than digitise thousands of route pairs from a paper timetable, which you can still do if you don't want to write a scraper.