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.
When flying with Delta Airlines you will face fees for checked bags, as of Spring of 2011, of $23 for the first bag and $32 for the second bag. International flights to Latin America and Europe typically allow one checked bag for free while charging around $20 for a second checked bag.