FlyerTalk Evangelist
Join Date: Nov 2018
Location: Istanbul, Turkey
Programs: TK Elite Plus,BAEC GGL,ITA Executive, AFKL Gold,QR Gold,HH Diamond,Bonvoy Gold,ALL Gold
Posts: 14,186
Nobody expected the US Presidential Proclamation to stay active for more than 6 months when the PHX-LHR route was first postponed to December.
UK hasn't established a travel corridor with the USA ( -> quarantine ), nor the USA is accepting visitors & several visa type holders arriving from the UK
So, IMO, for an unforeseeable future, this route would remain BA only with x3 weekly flights only.