Depends how long you will be gone. If you're going to be gone a long time, uber to the airport so you don't have to pay for parking. It's not the best part of town, I'd use the garage. It's $12/day.
Garage, always. Birmingham airport parking is really cheap compared to others in the nation. The economy will only saves you a couple of bucks even on multi-day travel and you can't beat the convenience of the garage being attached to the terminal. Better yet their vallet parking is also affordable.
If you're an airline pilot or flight attendant that commutes, you can have a parking pass issued to you so you will be able to park in a designated area at no charge. Otherwise, it depends on how long you need to park.
My rule of thumb is to go for economy if more than a day.
Depends on how much you want to spend how long you're going to be gone
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