We are missing some technical information here. If the engines were running I would have thought the packs were running or were they not man enough for the heat? Also, what sort of airport is unable to deal with a sick passenger? Is the true cost of a free-for-all unregulated market? I'm going to guess this aicraft was stuck in a long taxi queue and couldn't return unless the aicraft in the front were moved away and the packs only really work well when airborne. Which means that...