Originally Posted by ORD2323

Adding onto my original post:The only pattern I see is some medium / long haul intl flights departing between ~2-3pm ET.

It’s not just wide bodies or hub departures (PLS-EWR 73M9 at 1430 is cancelled, along with its 1030 inbound)

Some before that window are fine (SFO-HND 772 at 1015 PT)

Short haul intl is fine (ORD-YVR 738 at 1305 CT)

Some long haul intl in that window is fine (EWR-LIM 752 at 1410 ET)

It's not an aircraft availability thing (The RT EWR-PLS-EWR is canceled, but the cancelled ORD-HND has the A?C's returnleg operating and an unrelated (from the A/C perspective) flight cancelled (see below))

So it’s not widespread like a “all flights before # pm are cancelled” (evidenced by SFO-HND), it’s not even all intl within a time window (evidenced by EWR-LIM), and it’s not wide bodies (evidenced by the PLS flight)

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Another example. The ORD-HND A/C cancelled on 2/4 usually comes from GRU then flies to HND, they returns right back to ORD (+1 day).

So the cancellation on 2/4 would also cancel the 2/5 flight.

Instead HND-ORD is cancelled on 2/4 but is operating on 2/5. So I assume the 78X from 2/3 is sitting in HND from arrival on 2/4 afternoon until 2/5 instead of a direct turn on the A/C.

The 1820 departure from HND on 2/4 is 420 ET, which falls well outside of the impacted 2-3PM ET range I’ve found.