Did you have other backups to get out of LHR? I believe BA, VS, and AA also do many trips to several points in the US. UA also does flights to DEN, SFO, and LAX. There are many others that have flights from LGW, such as CO, DL, NW, US, AI, and some more VS.
Whenever I travel (be it across country or just a hop to the bay area), I always have backups ready, since you never know when there will be a cxl. They are fully refundable if not used.
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