During the cold war in the early/mid 80's, a scheme to fit some of BA
's 757s for (not with) wing refuelling drogues for use in wartime was discussed.
It never happened, and for today's mostly 'out of area' deployments, the chosen tanker, the A330, is the way to go.
I remember when first starting at BA
seeing the then brand new 757s, they were serviced in the now demolished TBB hanger, alongside Concorde, foreign 707s and the odd VC
-10 from Oman.
One of the early ones, cannot remember the reg, was leased to Air Europe but in the BA
livery with Air Europe titles, I first noticed this aircraft while in the cockpit of a L1011 being towed to carry out an engine run.
Apart from the late, lamented supersonic flagship, I remember the best take offs beng on 757s, we should keep the flexible E4
engined aircraft as they are flexible aircraft.
Pleased as I am to see us getting A321s, I cannot see that aircraft as a 757 replacement apart from on the shorter routes.