Where do I find airline timetables?
 

I see that the paper OAG Guides are being discontinued after December. This is a shame as I found them the easiest way to work out which airlines flew where, when and with what type of aircraft although the large number of codeshares has made them less useful in recent years. Information is obviously available online but it is hard to get an overview. (Some airlines don't even have a weekly timetable online.) Is there a free service that gives similar information?

Presume this was the old ABC World Airways Guide? When I was a teenaged spotter, a friend managed to get copies each year from somewhere, fascinating to thumb through on wet afternoons when even the birds were IFR...

Edit: Blimey! Wonder if he still has any in his loft? https://tinyurl.com/45ep3tmd

If I am going somewhere new and need to know which carriers are available - I work backwards:

1. Most airports have their own entry in Wikipedia. Scroll down and they have a list of carriers and destinations
2. Use FR24 [other flight related sites are available] and look at the intended destination Arrival / Departure boards

Probably not the ideal solution, but my quick way of finding out the flight schedule between a city pair on a specific airline is the "Routes" subpage that you can access through the Airlines database in FR24:
https://www.flightradar24.com/data/airlines
E.g. United:
https://www.flightradar24.com/data/a.../ua-ual/routes

Limitation: with the free account, flights are visible only 7 days in advance.

OAG and ABC merged many years ago and continued to publish the WAG with OAG branding.

I spent many happy(?) hours getting paid to trawl through them in the 80s/90s, reverse-engineering an airline's route network so that we could sell them a less suitable aircraft. :O