If Spirit shuts down, look for Southwest to re-run its gouging playbook at BWI and anywhere else Spirit's departure leaves Southwest in a dominant position.
Sometimes I feel like I’m the only O&D left at BWI. The fact that TSA can get away with only one PreFlight for A/B/C is pretty telling. Hope all of you transfers enjoy the big new concourse expansion (assuming you’re lucky enough not to have to find the C pier).