Sunscreen blocks UV, not cosmic rays, which is the radiation for which jetliner passengers receive an unusually high dose. The glass in the windows probably bl

Sunscreen blocks UV, not cosmic rays, which is the radiation for which jetliner passengers receive an unusually high dose. The glass in the windows probably blocks 75% of UV, and UV exposure is associated with other types of skin cancer, not melanoma (except in cases where one has a history of bad sunburns). In fact, in this review, melanoma is said to be inversely correlated with occupational exposure to UV: https://pubmed.ncbi.nlm.nih.gov/9335442/ https://pubmed.ncbi.nlm.nih.gov/9335442/