I am planning to visit GIG, LHR, CPT, LHR, TLV and perhaps somewhere else in that order over the coming year starting and some other Asian places to make it an RTW and then returning to JFK or somewhere nearby. I'm thinking of trying to fold these into an RTW ticket since eg the JFK-GIG-JFK and JFK-CPT-JFK tickets are so expensive.

Problem is, they're really separate trips (ie. JFK-GIG-JFK in September, LHR-CPT-LHR or JFK-CPT-JFK in January, and JFK/LHR-TLV-LHR/JFK summer 2007).

I am flying coach and collecting AA miles so don't want any BA coded flights because of their mean mileage accrual.

Questions:

-- can I force AA codeshares with stopovers in LHR etc?

-- can I fly JFK-GIG-(some AA hub etc)-LHR and then break my RTW ticket with a stopover from Sep to Jan in LHR before my January trip to CPT but meanwhile do an LHR-JFK-LHR ticket between those dates to spend those months in the USA? Does that count as nesting tickets?

Any other advice appreciated!