Ryanair is hoping to make up for lost revenue during the Covid-19 crisis by competing fiercely in the private charter market. In correspondence seen by The Currency marked “strictly private and confidential,” Europe’s largest low fares airline has written to various potential customers offering access to the top-end of its fleet for private hire.  “Large groups can avail of Boeing 737-800s through chartered services with a fleet of over 480 aircraft across 78 European bases,” Ryanair said in a letter sent recently.  The airline said it could offer “tailor-made” services for groups of up to 189 people on a 737-800…