1, American Airlines CEO Doug Parker and President Robert Isom sent a letter to employees, stating that all U.S.-based staff and some international crew members must get vaccinated under Biden's new mandate, as the airline company is 'classified as a government contractor.' According to The Wall Street Journal, airlines do significant business with the federal government, since 'they transport federal employees for work travel, have contracts with the Defense Department, and many participate in the Civil Reserve Air Fleet program.'