It may not be the deciding factor in where you vacation, but a city that offers free public transit from the airport to a major city site, metro stop or terminal is more likely to entice a tourist than one which is harder or more costly to get into. This is not an exhaustive list, but a sampling of airports with free city transit. The trend is not growing rapidly, but it is getting more adherents as time passes and traffic and parking issues become more of a factor .
Boston Logan International Airport
The free portion of this program only extends in one direction, from the airport to a city transit hub, but it is assuredly a welcome gift after any flight where travelers may want to collect themselves and their luggage and be inbound to the city before fumbling around looking for their wallets. The service began as a way to create more space, since the airport had nowhere to build extra parking garages. Then it became a green initiative on a trial basis which has extended now to a permanent one. The bus Silver Line SL1 to South Station Boston for Red Line connections is free. From South station one can move about affordably to the rest of the city. This is the best route to take to get to Cambridge, Harvard and MIT as well. It runs from 05:30 to 00:30 each day.
LAX Los Angeles
Getting into and around Los Angeles can be a daunting task. Thankfully there are many affordable options to move from the mega airport complex to the city and there is even a free portion which is covered by a shuttle bus service. It takes passengers back and forth from the airport to the Aviation Station on the Green line of the Metro. In order to take this bus passengers should direct themselves to the LAX Shuttle & Airline Connections sign and wait there. These can be found on the Arrival Level islands (lower level) in front of each terminal. The G shuttle is the one to take. The C shuttle as well will arrive at the exact same pickup points and this is a free connection to the Metro Bus Center which takes passengers to a fleet of buses serving the entire LA area.
Incheon Airport Seoul
The free portion of transit from this airport to the city is not for the final destination guest, rather it is for the layover tourist. Incheon offers those with stopovers of a lengthier stretch (not uncommon for big trans-oceanic flights) the opportunity to embark on 2, 4, 5, or 6 hour excursions into the city. The tours range from Night tours, Temple Tours, Seoul City, Incheon City and more. The tour has a guide giving an English language presentation with ample time to browse and explore. Any meals or admission fees to sites are the responsibility of the guest. The first place to find out information on what one can do is to stop by the Transit tour desk before immigration at either gate 25 or 29. Once there you can be instructed in what your possibilities are. It is a great way to see the sights when one has hours to spend otherwise just waiting around.