I dont know about that even JB is running into alot of Stuff and seeing a run on their $$$$.
If it began as ATC but after being released it was a plane prob and they could have still made the connect had it not been for the plane prob, Id hope that the carrier would do the right thing and step up and take care.However the OP didnt mention it that way so Id assume it wasnt ATC in that case.
Would this mean if one is flying on SW/BJ/AirTrans/ATA that if you miss your flight due to a non-ATC reason that you have no protection and the carrier needs to do nothing to put you up or rebook you on another carrier? I always assumed that since they are reg carriers that they would have to rebook you onto another carrier under that Rule 240.