I want to reach baltimore airport at 7am. What is the best mode of travelling other than car?

AIRPLANE duh

MARC train or Eyre bus.

... TAXI? or.. you can go to new carollton station metro thingie and take a taxi from there... the BLUE SHUTTLE I think goes there too, it's pretty quick (blue shuttle is like a van/taxi thing) uhhh.... ship? O_O or your mega fast hybrid 23987389273 horsepower car?

Try super shuttle, or check to see if MARC rail runs on Sunday.

Depends on where you're coming from.... Go to: http://www.wmata.com/ and check their Metro schedules. Good luck.

Take the Super Shuttle (1-800-BLUE VAN). They will pick you up at your house or hotel and get you to the airport in time for your flight.

You could also book a hotel room for the previous night at one of the many hotels around BWI. They all have free shuttle service to the airport - and you would not have to leave home so early as you would with Super Shuttle. You would also get a free breakfast at most of the hotels.

Someone mentioned Metro. It goes nowhere near BWI. The MARC train is not a good option, either, since you would first have to go to the train station.

MARC trains do not run on Sunday, so that is not an option. You do not say where you are coming from - which would be helpful.

On Sunday the B30 bus does not run until 8:45 or later, so that will not work for you.

A taxi is the most reliable and quickest way to get to the airport, but it can be quite expensive, depending on when you are coming from.

IF you are coming from inside DC, there IS an Amtrak train for $12 that leaves early enough for you (a little after 6) and gets to BWI 15 minutes or so before 7.

IF you are not, the Super Shuttle is another option. It's more cost-effective than anything but Amtrak, but can take a very long time, because they pick up multiple people.

Hope that helps.

It would help to know where you are coming from... from San Francisco, I'd say by airplane. But if you're coming from somewhere local, you could

-take a cab
-Take a Baltimore city bus (you can find their schedules at http://www.mtamaryland.com/services/bus/)
-Take MARC (commuter train service, http://www.mtamaryland.com/services/marc/)
-AMTRAK

or BWI is near a bike trail!

Amtrak