Britannia is actually the Cyprus Airways CL-44 5B-DAN (might have had more than one) and I think the 707 is a Korean Airlines freighter if I recall my colour schemes aright. Pretty certain I saw them there on several occasions.
I'm not actually sure who's the third 707 is - Pelican Airways? A partial Dan-Air scheme?
I lover seeing old pics of airports - American airport pics from the 50s/60s/70s are often a treasure trove of background gems, sadly mostly smelted now.