-when your first passport is out of travel visa pages

-when your first passport has less than 6 months validity remaining

-when your first passport is unavailable due to: delays in applying for a travel visa through a consulate or embassy.

-when your first passport is unavailable due to: delays in applying to have pages added or renewing the passport through the US State Department.

-when your first passport is denied by a foreign country from entering their country or the processing of a travel visa  or based on the first passport having entry stamps or visas showing travel to certain other countries.

-when your passport is misplaced, lost or stolen.

-when you need travel flexibility to process for pages, a renewal or multiple visas at the same time.

-when you want to use one passport for business travel only

-when you want to use one passport for tourist travel only

-when you want to transfer an existing valid visa from your first passport.