Originally Posted by ChiefNWA

The majority of DL's 763s were delivered between 1998 and 2000. BA has a ton of old 777s from the late 90s and the 3 LH Cityline 340s are only a year or two younger on average.

So you're either going to need to connect in the US to get on those brand spankin new tech wonders or you're flying WK, in which case, doesn't sound overly convenient for travel to/from the UK.