Doncas,
Thanks for that. On point one, if I was to put on a commercial head for a moment......
Wouldn't it be in the airlines interest to pay for a "2-hour" fluid so that slots aren't missed and cancellations are avoided (and profits not dented too much).
I assume a 2-hour fluid exists, if not, it's back to chemistry lessons for me as I've found a potential gap in the market.
Again, thanks for the speedy response.
Vankem