Cap-Gap Rule for F-1 OPT and H-1B Cap Filer
The period of time when an F-1 student’s status and work authorization expire through the start date of their approved H-1B employment period is known as the "Cap-Gap".
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Entering USA, what to expect?
What kind of problems can employment-based nonimmigrants (H-1, L-1, E-1, E-2, E-3, TN) face during reentry?
I think this question is most relevant for H-1 holders, but other employment-based nonimmigrants may also note the general principles here.