“If a visitor departs by a commercial air or sea carrier (airlines or cruise ships), their departure from the U.S. can be independently verified and it is not necessary to take any further action, although holding on to the outbound (from the U.S.) boarding pass - if they still have it - can help facilitate reentry when coming back to the United States.”
help.cbp.gov/app/answers/detail/a_id/880/~/definition-of-an-i-94
若不放心,可去【移民論壇】求證。
![](http://www.drc.com/assets/casestudies/uscutoms.jpg)
help.cbp.gov/app/answers/detail/a_id/880/~/definition-of-an-i-94
若不放心,可去【移民論壇】求證。
![](http://www.drc.com/assets/casestudies/uscutoms.jpg)