ATL-CPH a few years ago - the gate agent said we were delayed for mx. CA came out and explained what was wrong, how they were going to fix it, and the best case/worse case time it was going to take. He said he would keep us informed. Every 15 minutes is probably overkill if it's a 3 hour fix. Just tell us if something changes.

Made everyone feel alot better.

IIRC it had to do with potable water and how they had to flush the system and test it before they would release the A/C.