I think if you want the detail on the inside of the business, Air Transport World is the one to go for.
Airliners and Airways are nice for the enthusiast market, giving a good overall perspective.
I've never really liked the mags pushed out by Key Publishing - the publishers of Airliner World. Their previous titles, especially Air Forces Monthly, are in my opinion a bit trashy and firmly oriented towards the passing trade on the newstand market, rather than bieng aimed at the really serious enthusiast. Airliner World has avoided that trait to an extent but none the less still exhibits some of these tendencies. They must be doing something right with this title though, as it is one of the most popular aviation magazines published in the UK - I understand its success has even surprised its publishers.