Porter Airlines says it is once again pushing back its restart date amid the coronavirus pandemic to Feb. 11, 2021.The company suspended operations back in March due to COVID-19 and has since changed restart dates numerous times.“Deferring service until 2021 is not a decision we anticipated having to make as COVID-19 emerged early this year,” said Michael Deluce, president and CEO of Porter Airlines, in a statement Monday. “Every delay to restarting flights has the greatest effect on our team members, who are eager to do their part to help serve customers under safe conditions.