Originally Posted by
hermanc
Don't think that's true. My experience is the passport you use to check in / book flight has nothing to do with the passport you use to enter a country.
Doesn't matter which passport one uses to board a plane / exiting your departing country, you can still use a different passport while going through immigration entering your destination country.
Unless you are flying to the US for example, where your passport data in the advanced passenger information has to match what you show on the ground.