UV light does not just create repairable dimers in DNA bases, it can and does rip DNA apart. Enough exposure would cause more than enough irreparable damage to kill the cell and 99% of the cell being destroyed is certainly not salvageable.
Regional service for the airline is served by Delta Connection. Delta typically charges a fee for all checked bags on domestic flights, with most international flights having an allowance of one or two free checked bags per passenger, depending on destination.
What is the Checked Baggage Policy for SkyTeam Elite/ElitePlus Customers Traveling on Delta? SkyTeam Elite/ElitePlus customers in the Main Cabin are subject to the current checked baggage fees. For full details and baggage fees, visit the Baggage page.