Originally Posted by
bjsmith
On the comment regarding Wx ...
Could be. Typically I'll see the sub-50 passenger jets grounded while largers will fly. Maybe it was a JetBlue E-190 that was grounded by weather while the 717, 737 and A320s still flew that day. Or, as you said, it could have been a company restriction beyond what the FAA limited.
The larger passenger jets can usually LAND with slightly lower minimums than some of the RJ's, but it's not enough of a difference to result in mass cancellations...Wx rarely gets that low at most airports.
What you probably observed are arrival and departure slots being limited by low visibility at hub airports. When ATC has to allow more spacing between airplanes at a busy hub, some flights have to get cancelled. Mainline will usually cancel smaller airplanes first, since fewer pax (and less revenue) are impacted. It's about revenue capacity, not airplane capability.