As some have written: short notice leaves not much options.

And by short this means for me: better have some sort of prepacked carry-on.
Just too bad that on our typical destinations there's no J (or even F).
Typically the flights dont have more than some Y+/E+ and those typically out of sales already.

So I can cheer on Exit-Rows only - looks like most of the kettle dont know about those, so even on 6h notice I am able to book those.

Otherwise.. expenses are on the client side and they don't care. "Make it happen".
If business-case loses some 30-100k an hour (for my scale ops), they don't ask about travel or accomodation.
Aviation-at-FL-zero: get woken up at 4am and be driven in some Porsche at 270+km/h to a location that needed a fix (yep, bad planning, but well).

We/I need more international customers and J/F is on my list in no time