Originally Posted by
RWPrincess
I'm aware of that but they do have a reserve list and in this situation, the weather wasn't sudden. My point is they had time to plan in advance which they did not. Other airlines think and plan ahead in situations like this. Jetblue does not.
You seem really fixated on this point, but that's not how it works. At JetBlue, the aircraft type for the route is predetermined. Shorter and/or lower demand route = E190. Longer/more popular route = A320. I.e. it's not based on the demand on a particular day. When swaps happen, its most likely because there was a maintenance or scheduling issue with the original aircraft (or crew) or they need to re-position or re-route particular aircraft for maintenance, etc.
Check for yourself. NYC-ORD has one 320 flight per day (the first flight of the day, when most business travelers are headed out), the rest are E190. Thats just how it is.