The delays and cancellations dogging Germany’s airports due to staffing problems are not likely to let up any time soon, the country’s transport minister, Volker Wissing, said on Sunday. “The situation in the European air transport system is an enormous challenge for everyone,” Wissing told the newspaper Bild am Sonntag, noting that officials were unlikely to find a quick solution for the staffing shortage increasingly affecting people’s everyday lives. Airports in several European cities have been hit with chaotic scenes in recent weeks as demand for summer holidays surges, with passengers in…