They will do whatever you want, but there are a couple of issues with going through LHR to PEK, not the least of which is the restriction on two cnxns and one stopover per city. The Manchester shuffle will cost him two connections in London right there assuming that he takes AA transatlantic and BA back to Tel Aviv.

The other issue that may come up, and I say may because I just cannot recall how it's treated, but if the trip is measured stop to stop, and an open jaw is considered a stop on both ends, they might count the miles of the open jaw. If so, you bump above 20k. Again, I cannot recall if this is an issue on AA, but I know it is on other FF programs with this award.