Frontier Airlines is adding three new nonstop flights from BWI.

Good news for business travelers: Frontier Airlines is adding new routes to Charlotte, North Carolina, Chicago and Detroit at Baltimore/Washington International Thurgood Marshall Airport. Frontier said Tuesday it will kick off the service on April 10 with a new daily flight to Charlotte Douglas International Airport and four-day-a-week service to Chicago Midway. The BWI to Detroit Metropolitan Wayne County Airport flight will be offered three times a week in April and then four times a week starting May 25.