I think the short answer is that we don't really know. Basically, officially, we assume the answer is that there's no cost. I don't think that's a valid representation of what's involved in providing that kind of benefit. I do think we should probably look at it from a net benefit point of view: if there are costs, you also get a benefit in terms of economic productivity and weigh that against whatever it might cost in terms of the aircraft, to provide a full assessment about what we get out of that program, instead of just looking at the potential percentage points that you lose by requiring those types of investments.
On March 29th, 2022. See this statement in context.