https://www.cbsa-asfc.gc.ca/services/travel-voyage/prog/nexus/menu-eng.html
NEXUS: Trusted traveller program for travel by air, land and boat
Overview of NEXUS program benefits and services
travel by airnexustrustedtravellerprogram
https://www.cdc.gov/yellow-book/hcp/travel-air-sea/index.html
Travel by Air and Sea | Yellow Book | CDC
Find a list of chapters on how to prepare international travelers during air and sea travel.
travel by airand seayellow bookcdc