Step 1: refuel car offsite (optional)
Step 2: drive up to terminal (near where your check-in counter will be)
Step 3: turn off car, lock keys in car, go inside terminal
Step 4: call Hertz, tell them where their car is and that they should go pick it up
Step 5: hang up phone while agent is mid-sentence, board flight, turn off phone
Step 6: ...
Step 7: PROFIT!!!
-J.