From a typical place Earth, how many feet or miles must you go to be considered in outer space?

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IM5688 · 61-69, M

So basically, if you are flying an international commercial flight at an altitude of 38000 feet, you are just about where outer space begins?

No. You need to climb 10 times that altitude; to about 327,360 feet (62 miles x 5,280 feet)