Air travel across the United States is recovering more quickly from the depths of the pandemic, and it’s showing up in longer airport security lines and busier traffic on airline websites. The Transportation Security Administration screened more than 1.3 million people both March 12 and March 14, setting a new high since the coronavirus outbreak devastated travel a year ago. Airlines say they believe the numbers are heading up, with more people booking flights for spring and summer. “Our last three weeks have been the best three weeks since the pandemic hit, and each week has been better than the one prior,” American Airlines CEO Doug Parker said March 15. However, the airlines still have far to go before travel fully returns to pre-pandemic levels. While the number of people passing through airport checkpoints has topped 1 million for four straight days and the seven-day rolling average is the highest …