Necessary. >> we're going to continue to encourage it. i think there's additional steps and measures we can take to get the vaccine rates even higher. what we're seeing is every day those numbers continue to grow. i'm proud of our team. i think we have one of the highest vaccination rates in the country without a mandate. >> erica, there's also a labor issue. airlines are heavily unionized, the american airlines pilot union says 60% of its core has already been vaccinated. they're also encouraging that employees get vaccinated, but also underscore this one thing, any change to americans airlin...