Is there any reason why AF won't sell me a LP ticket when i search PHX-LHR for next July? They could do PHX-LAX/ATL/JFK/BOS/IAH-CDG-LHR, but when I hit search, it just directs me to the calendar, basically implying no itineraries.

(on the other hand, am I maybe a bit dumb for this routing in the first place? potentially)