American Airlines said Thursday it could take up to three years to get back to full, nationwide capacity due to what it said was an ongoing pilot shortage.

CEO Robert Isom told investors that demand for air travel is at record levels, but that the airline’s travel schedule remains impacted by supply chain disruptions and staffing shortages that worsened during the pandemic.

As a result, Isom predicted that restoring flight capacity across its main routes will take about a year. “I think it’s dependent on the supply chains of aircraft manufacturers and ultimately, pilot supply to get all back in sync,” the CEO said.