need to leave the car for 10 days

Wish I had a more definite answer for you. It was back in '93 when I flew out of Logan. At that time, there was a shuttle-bus service from some of the 'burbs. The furthest-out and closest to me was Natick. There was no marker, no big sign. You had to hunt-down the info. and meet the bus there at a strip-mall. Could you leave your car parked there in the parking lot for 10 days? I suppose it would be legal. Would it be safe?

Typically, I stay at a hotel close-in to the airport with a free shuttle, the night before. The hotel "park and fly" rate is greatly inflated (at least at the Priority Club joints) because they know you're on the hook for lotsa $$$ if you choose to park at the airport lot, anyway. But it's a nice, early "escape."

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"Riches are the savings of many in the hands of one." -Eugene Debs

thank you for your suggestions - the google search results had good info. Our current dilemma has been resolved. Will park at the train station & take the train into the airport.