I advise that you to read the T&Cs of that offer very, very carefully (before starting the $30k spend). It has some very onerous restrictions (i.e. all travel must be on BA metal, full taxes and outlandish levels of YQ are payable for both passengers, and travel must originate in the U.S.). You'll typically be spending more cash on these "free" tickets than any other airline charges for RT coach travel to London (all BA U.S. departures go to London). The best use of BA miles for NA passengers are typically on its partners (CX to Asia, QF to SWP, LA to S. America), but these routes are all excluded from the offer.... During periodic sales, RT BA business class to London can often be had for $1,000 + tax, so the potential "savings" from this offer may really only be around that amount. YMMV.