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.
Delta says: Basic Card Members with a Gold Delta, Platinum Delta, or Delta Reserve SkyMiles Credit Card from American Express and up to 8 people traveling on the same itinerary, may check their first bag for free on all Delta and Delta Connection flights.