Want a return flight from the UK to Arizona, with a stop over in Buffalo (UK to Arizona and back)

Want a return flight from the UK to Arizona, with a stop over in Buffalo (UK to Arizona and back)?
I'd like to get a return flight from the UK to Arizona (to arizona and back) and would like one stop over in Buffalo on the way there. How can I do this, is there a way other than just buying single tickets?
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unfortunately buffalo is not a international gateway to the UK (no flights leave there go overseas from Buffalo) you would have to leave from either boston, or New york (usually JFK or Newark) you could how ever have this routing LHR-PHX -phx-buffalo-JKF-LHR or you could fly lHR to PHx- then PHX-JFK -then train to/from buffalo-then JFK -LHR a travel agent can arrange all this