I was looking at different travel routes for travel and found that some countries require a traveler to have the passenger locator form filled out prior to entry. this is in addition to a covid test.

Some countries' immigration and health authorities require passengers to leave a health and travel history record. In those cases, IATA suggests the use of a card based on the Passenger Locator form and providing an additional section, the Health Declaration Card:

Download the suggested IATA passenger locator form:

English (pdf)
Spanish (pdf)

WHO, ICAO and IATA advocate the use of the same Passenger Locator form. See instructions from WHO and ICAO.

When returning to the UK everyone has to fill out a locator form now.
£500 fine if caught arriving back without one