(Reuters) – FedEx Corp on Tuesday suspended its domestic express freight services due to a staff shortage as cases of the Omicron variant of the coronvirus rose. The delivery firm said it is suspending the economy domestic FedEx express freight, including FedEx two-day freight and FedEx three-day freight services. International economy freight pick-up services, which had been paused earlier, resumed on Monday, FedEx added. Last month, the company had warned that rising cases of the Omicron variant had caused a staff shortage and delay in shipments transported on aircraft. Severe winter storms …