Free airport parking for pick-ups
Many airports charge like a wounded bull for parking while waiting to pick up arriving passengers. Some even provide no short-term parking options forcing those waiting to drive around and around in a loop.
However, some enlightened airports provide (or have available nearby even if the airport itself didn’t provide it) free or cheap parking. This is sometimes referred to as cell waiting or cell parking area. Check out which airports have cell waiting areas in this handy thread.