I commuted to BWI for a yr from NYC. You can fly into DCA and take the train to BWI. It'll take an hr. Uber rides aren't that bad $40 and will take 30-45min. In a pinch those will work. There's also a bus but I never researched that one. If there are flights on company metal use that and if you can't get on use the commuter policy. I did once when NYC shut down for 2 days for snow. Not even a question from scheduling.
I've met several who commute from BUF and all have done both bases. Either is relatively easy