I fly 30+ times a year NEVER on Spirit they are the worst even worse than Delta and that’s hard to beat. I’d rather self pleasure with 40 grit than fly spirit. I thought 3 and under didn’t have to wear masks it’s not like they can shed enough virus to be contagious there is some sound research that shows children cannot cultivate enough virus asymptomaticly to spread it via airborne droplets so unless you are letting them touch your face any other passenger should be fine.
I also thought that the guidance for babies of that age was that they didn’t need masks.
I’ve never flown at all; but if it ever becomes a necessity, I’ll remember your wisdom.