Tracing products, such as contact tracing apps and wearable devices, can be useful for airline travel by helping to identify individuals who have been in close contact with someone who has tested positive for COVID-19. This can help to quickly identify individuals who may be at risk of infection and take appropriate measures, such as quarantine or testing, to prevent the spread of the virus.

Contact tracing apps use Bluetooth technology to detect other devices that are nearby and log the contact, which allows for a quick and efficient way to trace close contacts in case of an infected person. Wearable devices, such as smartwatches or fitness trackers, can also be used for contact tracing by logging proximity data and allowing for easy access to it.

Airline and airport companies have been using these technologies to help prevent the spread of COVID-19 and make travel safer for passengers. By using contact tracing apps and wearable devices, they can quickly identify and isolate individuals who have been in close contact with an infected person and take appropriate measures to prevent the spread of the virus.

Moreover, these tracing products can also be used to monitor compliance with health protocols such as temperature checks and mask-wearing, and to provide a way for a passenger to prove they are cleared to travel.

It's important to note that the use of contact tracing apps and wearable devices for travel is still a developing field and the specific protocols and requirements vary depending on the country, airline or airport.