No shuttle. Long term is something like $14/day and short-term is by the hour. You can look up the prices online though.
Just buy a Transbridge bus ticket (cheaper than paying for parking) get a parking permit from them and get your walk on. Shh you didn't hear this from me.
There's no shuttle and really no need for one. Parking isn't free
I am not aware of economy parking or a shuttle the lot is adjacent to the terminal not a long walk
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