We've seen in other countries around the world and through our relationship with the World Travel & Tourism Council that from the very beginning other countries have been monitoring and putting in place other testing regimes and contact-tracing options.
Iceland is an example. Very early in the pandemic, when they wanted to see a return to travel, they put a testing regime in place. They have been extremely successful. Upon arrival, visitors would be tested. They would have to remain in quarantine until the test result came out. As soon as a test result came out that was negative, they were able to travel freely throughout the country. They've been able to keep their numbers of positive test results down to almost nothing in days after arrival.