Flying or driving doesn't matter.
If you use old I-94 to return (auto visa revalidation), visa stamp is not used at all, you don't even need a valid visa. If you use visa stamp to enter, (so you are entitled to a new I-94 with a new date), one entry will be used.
If you use old I-94 to return (auto visa revalidation), visa stamp is not used at all, you don't even need a valid visa. If you use visa stamp to enter, (so you are entitled to a new I-94 with a new date), one entry will be used.
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