The glass/plastic composite will screen out quite a lot of UVA/UVB but not all and its quite intense at altitude so getting into the habit of using a good sunscreen is sensible. You may have to try several before you find one that suits you. Don't forget your ears and hands.
Even today pilots spend time in the open on the ramp and you can pick up a fair bit of exposure there.
Outdoor sport, golf, tennis, climbing etc., etc. is a potent source of photodamage and precautions are wise.
There's no reason to get excessively alarmed though, just be sensible.
"Slip on a shirt
Slop on sunscreen
Slap on a hat"................as they say in Australia
