Officials with American Airlines, United Airlines and Delta Air Lines said they also were taking additional security measures in the Washington region.
American and United increased staffing and said they were working closely with law enforcement. Charles Hobart, a United spokesman, said the company would “continuously monitor the situation in real time.”
American decided to stop offering alcohol in first class Thursday on flights in the D.C. region. The airline already had halted alcohol service in economy class in response to the coronavirus pandemic.
“We will continue to enforce policies that ensure our customers’ and team members’ safety and well-being,” the airline said in a statement.
Delta said in a memo to employees that it urged crews with layovers in Washington to remain in their hotels and would increase security at National, Dulles and Baltimore-Washington International Marshall airports in ways “both seen and unseen.”
A spokesman for the Transportation Security Administration declined to comment on specific safety measures but said the agency is prepared.
“The TSA is always on high alert. We prepare for all contingencies,” said spokesman R. Carter Langston. “For security reasons we do not discuss the details other than to confirm that there are always multiple layers of security in place, especially when events justify an increased security posture.”