UPS said Friday it had paused U.S. departures under the nationwide Federal Aviation Administration ground stop. FedEx said it was monitoring the disruption and told customers to check the status of individual shipments. The restrictions affect cargo as well as passenger flights, so an overnight package could be waiting for an aircraft even if local delivery trucks are running.

UPS posted the pause on its service alerts page and said its flights within and between other countries were unaffected. The notice gave no package-by-package delivery estimate. FedEx spokesperson Shannon Davis told the Associated Press that the company was prepared to use contingency plans and would resume normal flight operations when the FAA permitted it.

Marken, a life sciences logistics carrier, warned clients that U.S. air freight and shipments on connecting international routes could be delayed. It directed customers with an upcoming or existing shipment to their Marken representative. For air travelers, the FAA has allowed some departures while the broader stop remains in place.

Where to check your package

Use the tracking number from your shipping receipt or order confirmation on UPS Tracking or FedEx Tracking. The carrier’s nationwide notice explains the flight disruption. Tracking is where to look for a revised estimate on the specific package. If a store arranged the shipment and you have only an order number, ask the store for the carrier tracking number.

If a delivery misses a promised time, check the service name on the receipt before requesting a credit. UPS lists its eligible services and current guarantee terms. FedEx lists its eligible services and exclusions separately. The flight pause alone does not establish refund eligibility. For mail sent through the Postal Service, USPS issued a separate notice.