Air travel at Boston's Logan International Airport has rebounded from historically low levels it saw during the height of the coronavirus pandemic in 2020. However, Massport doesn't expect air travel to reach levels seen back in 2019 for another three to five years. Massachusetts Port Authority CEO Lisa Wieland said in a presentation to the Joint Committee on Tourism, Arts and Cultural Development on Friday that passenger volumes traveling through Logan International Airport "fell off a cliff" at the start of the pandemic, dropping as low as only 2% of pre-COVID-19 travel at its trough.The number of passengers traveling through airport checkpoints nationally has been on the rise, but Wieland said the recovery has been uneven.More than a year into the public health crisis, passenger volumes are still down "nearly 70%" compared to before COVID-19, Wieland said. "On a typical day in 2019, we'd have about 1,200 inbound and outbound flights a day. Right now, we're averaging around 500 to 550," Wieland told the committee.Passenger and flight traffic at Logan Airport, which tends to depend on business and international travel, two sectors that have been very slow to return -- is down 70%. At other airports across the country, travel is down approximately 50%. "We estimate we'll finish this fiscal year with about 10.5 million passengers. Logan really hasn't seen that low of an activity since the mid-1970s," Wieland said.She said there are reasons to be optimistic about the summer season given increasing interest in travel, but said COVID-19's impact will continue to linger for several years. "Because of where we are today and because of our dependence on business and international travel, which have been much slower to recover, as well as some structural changes in the airline sector, we are expecting it's going to take us about three to five years to get back to our 2019 levels," Wieland said.Information from the State House News Service was used in this report.