Heavyweight express carriers BAX Global and Airborne Express are still juggling operations in the wake of Tuesday’s terrorist attacks on New York City and Washington.

BAX Global, based in Irvine CA, said it is working closely with the Federal Aviation Administration and local Port Authorities to facilitate the speedy return of its aircraft fleet into its transportation network. To date, BAX Global said all of its offices, with the exception of its New York City facility, are open and processing shipments. The company added that it has heightened its security procedures and expects both its customers and partners to do the same.

BAX Global said it is also suspending all guarantees and service performance commitments until it can resume normal operations, with some services restricted due to the current crisis.

Airborne Express, based in Seattle, said it has bee relying heavily on its nationwide ground sort hub infrastructure and expanded line-haul trucking operation to move shipments, as its air fleet remains grounded per FAA orders. Though Airborne said its international operations are continuing with some delays, there are no trans-border operations between the U.S., Canada and Mexico occurring at the moment.