Well, it is not nonsense. I tried twice to make reservations the other day and progressed almost all the way through on both occasions, even to credit card validation and then got a "system unavailable" screen. I call tech support and was told very clearly that "delta.com is not 100% compatible with Safari" which causes the problems that I was having. It was suggested I use Firefox. I sent a complaint email saying it was ridiculous that they are not able to make their website compatible. And yes, I have all my security setting set properly.