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.
There is no free checked baggage allowance. Passengers can pre-purchase 15kg, 20kg, 25kg or 30kg of checked baggage allowance via the website, agents, call center or booking ticket offices. Alternatively, 20kg of checked baggage allowance can be purchased at the airport counter 4 hours before departure.