Also, AA doesn't seem to care how you get there. For example:
LHR-ORD-ATL-ORD-CDG-HEL-FRA-LHR,w/layovers in HEL and FRA, $600
100% AA flight numbers.
A less expensive route, without the layovers:
LHR-ORD-ATL-ORD-JFK-MAD-FRA-LHR, $559
And as the're over 10,000 in 'W' Class you get Instant Platinum with the challenge^ Complete with 12 Months BA Lounge access.