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.
There is no free checked baggage allowance. Passengers can pre-purchase 15kg, 20kg, 25kg or 30kg of checked baggage allowance via the website, agents, call center or booking ticket offices. Alternatively, 20kg of checked baggage allowance can be purchased at the airport counter 4 hours before departure.