I as a Passenger travel to JFK twice a month and have made a small observation which is very noticable.After doing a bit of digging I discovered that the 767 is operated by two lots of cabin crew,BAR & CitiExpress,and from what I can make out CitiExpress is the poorer relative.Now the BAR crew always appear rude and very short and quite unhelpfull where as the CitiExpress crew are always very helpful and curtious.This is so obvious that I have written to BA.Can anybody here with the knowledge shed any light why this is so?