Speaking of companies paying for tickets and Delta's L-fare policy, I work with one company who was having big problems with it's employees waiting until the last minute to request travel so they wouldn't get stuck with L-fares, so now the company has said that they will not book you in L-class no matter how far in advance you book, so they're agreeing to pay the difference between L and the next class up because it's still less than having everyone wait until the last minute!