I received a Delta weather waiver alert last Wednesday ...said I could change flights due to bad weather getting back from FL to NYC's LaGuardia. Wait time on the call to Delta initially was two hours (I didn't wait and they have also changed their call-back policy, at least for me). After repeated phone calls.... got through & was told couldn't do it because I had purchased an economy class ticket. If I wanted to proceed, I would have to pay additional costs for a ticket. I decided not to pay the extra fees. I'm a Silver Elite which means basically nothing but Delta should not send out text message alerts to folks who bought economy class tickets or simply change their ticketing practice.