Atlantic City is an anomaly by every stretch of the imagination. The CA grid for April right now in my base has 5 total red days for the month, and 3 of those are red by only 1 number. So, if somebody picks up an open trip touching one of those 3 days, it'll no longer be red, and someone else would be able to drop a trip on that day in first come first serve priority. I myself wanted to drop a trip this month that touched a red day earlier in the month. Waited a couple days until it wasn't red anymore, and voila, now I'm off next week.