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.
JetBlue Airlines. JetBlue, while not totally free, does offer some free baggage options for domestic flights. JetBlue baggage policy includes one checked bag free of charge. A second checked bag is allowed for a fee of $30 and a third bag for $75.