I don’t have an issue wearing a mask as long as the A/C in the aircraft is cranked up sufficiently. I’ve worn just every type of mask now from bandanas, to cloth masks to surgical masks. The surgical mask seems to be the coolest one with the bandana being very hot. A surgeon friend said I should be breathing in through my nose and exhaling through my mouth while wearing a mask. Also said that washing glasses with soap and water, drying them a cotton cloth should eliminate fogging with the mask. I’m getting more comfortable in a mask but I’m not sure a 9 hour international flight wouldn’t be a slow torture.