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.
The Delta flight is cheaper. But check a bag at a cost of $25 for the first checked bag each way on Delta, and your total fare climbs to $256 -- more than the cost of the Southwest flight, which includes free first and second checked bags. Add a second checked bag for $35 each way on the Delta flight, and you'll pay a whopping $326.
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.