Fort Lauderdale (FLL) is my home airport. If you've never visited, it's a very different set up than places like Cincinnati or Orlando. Instead of one huge terminal, we have four separate terminals.
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Since you're flights are not international, chances are good that you'll be arriving/leaving from Concourse B. Although past performance doesn't guarantee future results, I checked and all flights to/from BWI for the past two days have used gates in Concourse B. So, getting a wheelchair might not be necessary.