This trail is usually noted to be 11 miles, but a piece of that is a short 0.4 mile dogleg to the terminal. So, if you do this trail, you are either going to do the main loop at 10.6 miles, or include the terminal and complete 11.4 miles. There are two nice overlooks. One is the Dixon Observation area with the crowds, playground, and parking, where you can watch the planes fly in. The other is at the northern piece of the trail, to the east of Elkridge Landing Road (another decent parking area, on street). This overlook includes benches and trashcans, and is a nice hill that overlooks that airport, where you can have a nice general view of the whole airport. In addition, as you leave this area heading towards Elkridge Landing Road, watch for the Emu farm on the right, in the woods.
This trail has lots of neat wooden bridges, some very long. In addition, to the east of the Dixon Observation area, it's shaded, and very pretty. It's a great area to take kids on short rides. You can ride from the parking lot, out to the shaded area in maybe .75 miles, and have the planes fly right overtop of you.
There is a 7-11 on the trip, but it's across a busy road. That is on Aviation Boulevard.
Lastly, they like to close the Dixon parking lot at sunset, and the trail itself closes at dusk. But, if you are on a long run or bike ride, and you are at risk of getting back late, I recommend parking in an area other than Dixon. If you go further west down Dorsey, there is a Burger King on the left in a shopping center, which is nice to park in just in case you hit sunlight issues.