Before the COVID-19 pandemic struck in March 2020, Rochester City Lines, a family-owned commuter and charter bus company in Minnesota, was riding high. “We were set for our best year ever in 2020,” said Christian Holter, the company’s director of operations. “And then the wheels fell off.” Half of the company’s business had come from commuters on its dozen fixed routes. Many worked at the giant Mayo Clinic medical complex in Rochester and commuted from areas in southeast Minnesota and the Twin Cities region. The company lost a huge chunk of its commuters when Mayo allowed many staffers to work…