Cirium: Monday Fern US Flight Cancellations Ease Sharply

LONDON — Cirium logged a sharp step-down in U.S. cancellations Monday morning, with the system sliding from a 45% Sunday peak to ~14% as airlines begin the recovery push.

Cirium’s Monday, Jan. 26, 2026 update (data current 8:20 a.m. ET) showed the storm’s hangover still biting in the Northeast and Mid-Atlantic—even as the broader network started to stabilize. Cirium pegged Sunday, Jan. 25 as the worst day since the pandemic in its dataset, with 10,766 cancellations out of 23,735 scheduled departures (45.36%) and D14 on-time performance at 65.04%.

For Monday, Jan. 26, Cirium counted 3,213 cancellations out of 23,357 scheduled departures (13.76%) in its by-date table, while its “today live” airline rollup showed 2,966 cancellations out of 20,806 flights (14.26%)—a normal gap for an in-progress snapshot vs full schedule accounting.

The worst pain points “today so far” sat where you’d expect after a snow/ice event: BOS (65.65% canceled), JFK (52.57%), EWR (45.31%), LGA (42.94%), plus pressure at CLT (23.61%), IAD (22.70%), PHL (20.48%), and DFW (19.89%) as downstream connections and aircraft rotations untangled.

On the airline side, Cirium’s live view put JetBlue (B6) at 53.29% canceled, with American (AA) at 21.61%, Delta (DL) at 15.48%, and United (UA) at 14.36%; Southwest (WN) ran near-normal at 0.37%. Cirium’s forward look suggested the network reverts fast: Tuesday (0.10%) and Wednesday (0.00%) cancellations sat near baseline on the schedule at the time of the update.