Maybe the yields were poor or inconsistent (sometimes good others not). It was an odd route, but not really as it was announced back in March 11, about when a lot of CLE routes opened up (after United closed the hub) and Frontier opened up the CLE focus.

However, Frontier transformed more to an ULCC by end of April and started charging carry-ons by end of April. The transformation was such that F9 wasn't going to be a Southwest or JetBlue, but more on the lines of Spirit.

I could imagine that there is some business traffic on the route who might appreciate the nonstop, but only pax that it can attract when the time works out.

I think Frontier will focus on larger cities (higher volume routes) and more popular destinations out of CLE as an ULCC.