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 it comes to Delta baggage, the airlines offers you one free personal item and another free carry-on baggage. Personal items include purses, briefcases, diaper bags, and laptop bags, while other items such as strollers, wheelchairs, jackets, and duty-free purchases are considered additional freebies.