BOAC - Just answer the question. You either provide O2 or you drop down and fly lower the rest of the way...will a 737 do it or not. Simple question..no fencing, no debate, no arguments, no dancing..pull out your book...you either know or you don't.
40 posts later....
You pretty much described ETOPS fuel: Fly to the CP, have a decompression, drop to 10,000 and continue to the destination. No secrets.