Deutsche Lufthansa AG management has apologized for the disruptions and cancellations bedeviling the global aviation industry and cautioned the situation won’t improve in the near future as carriers and airports struggle to rebuild operations from the pandemic slump, Report informs referring to Bloomberg.

In a letter sent overnight to customers, Europe’s biggest airline group laid out the causes of the chaos, from a lack of personnel to the war in Ukraine.

The carrier said global aviation is reaching the limits of available resources, frustrating airline efforts to recover losses after the coronavirus burst a decades-long boom in travel.

“We can only apologize to you for this,” Lufthansa said in the statement. “In the coming weeks, as passenger numbers continue to rise, be it for leisure or business travel, the situation is unlikely to improve in the short term.”

Germany’s flagship airline has canceled a total of 3,100 flights after a wave of coronavirus infections worsened staffing shortages, adding to Europe’s travel chaos as the crucial summer vacation period gets underway.

Having let go of thousands of employees during the pandemic, airlines and ground operations at airports are struggling to meet resurging travel demand. Lufthansa said the industry’s racing to rehire thousands of employees, though the push will only have a stabilizing factor this coming winter.