A substantive expression of appreciation

I claimed my compensation for having a decrepit plane for the transatlantic journey. This turned out to be a choice of an internal one-way flight within the USA to the value of $250, another flight-based opportunity that was no use to me, or 10000 air miles. I took the air miles, which takes my mileage balance over 100,000 miles - a tenth of the way to million miler status which gets you a lifetime premier status, so if I carry on making these trips at the current rate, that's only another 80 or so years (or 90 more substantive expressions of appreciation)