DHL offers worldwide services, including deliveries to countries such as Iraq, Afghanistan, and Myanmar. As it is German-owned, DHL is not affected by US embargoes or sanctions and will ship to Cuba and North Korea. However, there are strict codes for delivering to North Korea, as the country has shaky relations with the West.
As DHL is not a US company, it is not allowed to make domestic flights between US airports. DHL contracts these services to other providers