Thanks for all the advice - going either for the cab or the Port Authority - depends how I feel at the time !

Landing about 1055 on Friday lunchtime so hope to clear immigration / baggage etc by 12.30 ??? what are the lines like at JFK or is it just luck - can get thru ord from deplaning to outside awaiting collection in 20 mins !

Prefer to stick to AA or if necessary UA for the miles !

Would say going ANYWHERE is quicker than getting from T3-T4 at LHR !!