Intersting pricing on LCY-JFK.
If you want to travel on Sunday then can get for about £2k return.
Midweek can pay as much as £5k return. Outbound flights (stop shannon to refuel I suppose and replace crew) are as much as £2.5k less than the return. I am guessing these people will go to LHR for outbound.
So people value their time at £2.5k not to stop at shannon, but to hack across london to LHR and then fly non-stop?