I had a profile as an Member of National Rental Car in which I could reserve online (no credit card needed as the company used a Central Billing contract with National). I would go into my profile that I had Authorization to do so and reserve a Car which would be waiting on me at the Airport.
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There were a few times when I would drive the Rental Car home on a late Friday night with intentions on heading back to the Airport on Sunday night to return to my project, a few times it was delayed a few days so I went to the office with the Rental on Monday morning clearly using the vehicle for work purposes then back to the Airport on Tuesday to fly out.

