Re: ground transport to detroit airport
They won't let you check in. I've been given 5-10 minutes leeway before, but that was in Canada, and 30 minutes is really pushing it anyway.
Budget allows cross-border rentals sometimes between US and Canada, but it looks like they don't for Windsor Airport (closest car rental to Cottam) to Detroit Metro Airport. Looks like Avis is the same way also.
Go there the day before and get a hotel by the airport that has a free, 24-hour shuttle. It'll be more expensive, but you'll make your flight. You can also use cheaper transit options if you go the day before, since you'll have more time and flexibility.
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