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.
As of 2015, Delta allows passengers to bring one carry-on bag and one personal item on the plane for free. The carry-on bag is subject to size restrictions; if it does not fit on the plane, Delta representatives can check it at the gate and fly it to the passenger's final destination.