Spoonbill, I have been using soft contacts for a couple of years, with out any problems.
Both in aircon and aircraft, you name it. What really pissed me off was cleaning them every night. One day throw aways solved this but were expensive.
These "Focus night and day" are new to market, actually i am one of the first to try them in Oz, (so my optemerist tells me) and believe me they are terrific in all enviroments, from Aircraft to aircon to hot middle east climates.