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.
How to check in your bags for free on Delta, Continental. Published 5:30 am, Monday, May 17, 2010. Delta has a new baggage offer that could help ease the onboard roller derby for overhead space. Beginning June 1, Delta American Express affinity cardholders will be able to check one bag free on Delta. Delta currently charges $25 each way to check a bag, so you could save $50 each time you fly round trip if you have the card. The offer extends to up to nine people flying on the same reservation, so if you have a family of four, you could save $200 round trip if each person checks one bag. Even with this offer, you'll want to pack light; Delta charges $35 each way for the second bag. The annual fee for the cards starts at $95, but those fees could easily be made up if you fly several times a year or if you travel with family.