On: Southwest cancels 5,400 flights in less than 48 ho...

[josephcsible]

This storm affected trains too <https://www.trains.com/trn/news-reviews/news-wire/amtrak-can...> <https://chi.streetsblog.org/2022/12/28/the-polar-vortex-expr...>. What was the last weather event that resulted in significant disruption to air travel but didn't disrupt rail travel?