You’ve got to get this technology approved. Then you’ve got to actually get those aircraft into the airlines. A company is not going to just replace its entire fleet overnight. The fuel savings of modern jets are massive compared to the savings you are speaking of, and yet we didn’t immediately bin the 747 overnight. BA pilots are unlikely to have to worry about your scenario for at least another decade or two. It certainly isn’t making me think I need to rush out and get my command before I get made redundant.