No such thing as a stupid question, ....BUT
For what reason does the BA A318 from JFK to London City always seem to divert to Gatwick when there are weather issues at City??
Possible reasons are
No available slots at Heathrow?
Better connection from Gatwick to the City?
Southend not seen as posh enough for the executives?
Not that I am likely to be rich enough to use the service
Regards
Kiltrash