Originally Posted by
secamp32
I'm confused about this process. My wife recently got a Mexican passport in addition to her US passport. I believe that she needs to present her Mexican pp to Mexican immigrations and use the "Nations" line when we enter Mexico. Should she show that to the airline when we check in at the US airport? What about checking in at the Mexican airport when leaving? Does the pp info that you provide to the airline transfer to immigrations? She obviously needs to use her US pp to enter the US.
You are not so confused - you have it rigtht.
Correct - present Mexican passport to airline agent at check-in when departing the USA. Present Mexican passport to Mexican authorities when arriving in Mexico.
When departing Mexico, show the US passport to airline agent at check-in.
Yes, the airline will include passport info when it sends passenger manifest information to the US Government.
Yes, she needs to show her US passport at immigration on arrival to the US.