I found something interesting today when looking at the Route Map on the Southwest Airlines website - it shows nonstop service between Little Rock and Pittsburgh. I didn't recall hearing an announcement about this new service so I searched the flight schedules. There are some nonstop flights between the cities, but only on a couple of days.
Thursday, 2/3
Flight #215 dep PIT 9:20 a.m.; arr LIT 10:45 a.m.
Flight #149 dep PIT 5:45 p.m.; arr LIT 7:10 p.m.
Friday, 2/4
Flight #254 dep LIT 2:05 p.m.; arr PIT 5:10 p.m.
Monday, 2/7
Flight #127 dep PIT 12:25 p.m.; arr LIT 1:50 p.m.
Thursday, 2/10
Flight #116 dep LIT 8:55 a.m.,; arr PIT 12:00 p.m.
Flight #151 dep LIT 5:50 p.m.; arr PIT 8:55 p.m.
That's it - there are no more non-stops between Little Rock and Pittsburgh through the remainder of Southwest's open schedule through August 12.
Any ideas on what these flights are? Maybe re-positioning due to the weather cancellations recently? Something with Super Bowl since the flights surround Super Bowl Sunday?