BWI is a large and reliable airport serving the greater Baltimore and Washington metro area. I've used this airport on several occasions and have had good experiences each time. They have recently undergone extensive renovations, including a new parking garage and plenty of covered walkways to the main terminal. I also like that the parking garages actually guide you to empty spots by showing numbers of free spaces at the end of every row. My only complaint about BWI is the food options for travelers. There's not many chain establishments here, so you're pretty much stuck at a sit-down restaurant or the City Deli (overpriced) grill.
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