UA started phasing in ACA into ORD <-> BNA in October. Used to be nice and easy with AWAC running everything. On an BNA -> ORD flight at 6:00pm, you may watch 2 AWAC planes unload and park for the night while still waiting for your plane to arrive. Since ACA flies, my 6pm has left no earlier than 8:30pm on 3 occasions.
Dec 10, they did the ultimate. 5:47p to IAD and 6:20pm to ORD scheduled with ACA. ACA has only one plane on the ground as of 5:30pm. IAD delayed until 6:30pm. Passengers board. Snow starts falling in BNA, but not sticking to anything. They pulled the IAD pax at 8:30pm, rebooked and then put ORD pax on the same plane?! We finally took off at 9:15pm!
Only exp with ACA has been hell. AWAC delays were never worse than an hour, or cancellation was announced before I left for the airport.
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2nd Year Prem