Originally Posted by GagaPilot

Not entirely correct, but I get where you are coming from. While there are generally no FAA published holdover times for moderate freezing rain, there’s a way that in some cases one can be derived from chart notes and how to apply the current conditions and fluid type to generate a holdover time. It comes down to how a certificate holder’s de/anti ice program looks at these rare conditions (moderate/heavy freezing rain, heavy snow, etc) and whether takeoff is prohibited. I’m not a DL pilot so can’t say what their policies are, but at some US airlines there are ways to legally takeoff in those type conditions. (Not advocating doing so, and you’d have to be at a small station, applying fluid at the end of the runway just minutes before departure, etc). Point is there’s no Part 121 blanket “takeoff is prohibited” it’s just a “caution no holdover times exist” - and then you follow company specific procedures from there.

Still, not like any of that is gonna help DL in a station like ATL of all places. It’s more for a remote station like FAI to get you out.

Hoping the 9L event just now in ATL did not result in injuries - thoughts for all those involved.