As for the approaches: As Boston is right on the water, winds can vary, and often change several times in the course of a day. It really depends on the winds at the time of your arrival. If you want a water approach, your best scenario would be for winds to come out of the northwest. This puts runway 33L as the primary arrival runway, which puts your approach south east of the city, and takes you in, eventually over Outer Boston Harbor. On your departure, runway 27 is the primary departure runway (with significant departures off 33L as well). If this is the case, do your best to secure a window seat on the right side of the plane. During take off, you get a great view of the airport, and a beautiful view of the Inner Boston Harbor and downtown.
The other main water approach is when the winds are out of the west. 27 is the main arrival runway, which means you come in from Northeast of the city over the ocean. The main departure runways are 22R and L, which means you'll pass over the harbour before turning out over Massachusetts Bay. That's a nice departure as well. Once again, try and get a seat on the right.
If the winds are out of the north, your approach will be on runway 4R or L, which will briefly take you over Boston Harbor, but for the most part it's a land approach. Your departure will be off of runway 9, which means you'll immediately go out over the small spit of land called the Town of Winthrop, then out over the ocean.
I hope this helps a little.
US Airways is currently the largest airline in Boston, with almost 200 daily departures. Delta/Delta Connection/Delta Shuttle are second, and American/American Eagle are third with about 170 and 160 daily departures, respectively. United lags far behind at a very distant fourth, with only about 65 daily departures, but unlike the other three, almost all of United's departures are on pure jets, unlike American Eagle's large SAAB hub, and US Airways with a lot of DHC-8 and Beech 1900D flights.
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