With Sun Country ending service at Lansing, that means the end of non-stop service from Michigan’s capital to Washington National airport and indeed the end of non-stop service to the DC area and even the Northeast.
National airport is slot controlled, but Sun Country had an ‘exemption’ from slots for their flights rather than having their own slots. American Airlines is petitioning the FAA for a slot exemption so it can serve this market in Sun Country’s place, arguing that it’s an important market to preserve service in.