Parcel delivery giants FedEx (FDX.N), opens new tab and UPS (UPS.N), opens new tab said on Tuesday they would return any tariff refunds to customers ​as the U.S. government begins to return the illegally collected ‌levies.

UPS and FedEx have grounded their combined fleet of over 50 McDonnell Douglas MD-11 cargo planes following a UPS crash in Louisville that killed at least 14 people. The UPS MD-11 erupted into flames moments after takeoff from Louisville Muhammad Ali International Airport on Tuesday, and the cause is still under investigation.

Air traffic at Liege Airport was suspended for nearly an hour on Friday morning after air traffic controllers detected a drone flying in a restricted area, the third such incident reported this week.

On Friday, U.S. stocks showed mixed results as investors assessed a decline in FedEx and anticipated additional rate cuts from the Federal Reserve after the significant reduction announced earlier in the week, News.Az reports citing Investing .