There are also tourists and students still trying to get home, delayed by the restrictions in countries outside the US + limited flight options. My son has elected to stay in the UK for university, but it has taken some of his friends 2-3 weeks to get home. The combinations of flights, restrictions (must enter thru certain airports), interruptions in ground transport, and cancellations have caused significant delays en route. The US govt has repatriated many, but they encourage citizens to try commercial travel first.