Last Thursday I looked out my office window to see a mysterious looking 737 or 319 took off from GRR, Gerald R Ford International Airport (formally and more liked Kent County Intl) in Grand Rapids, Michigan.
I say mysterious because it obviously had a different color paint scheme, and true to Michigan weather, it was a grey outside with made visibility all the more difficult. The airplane appeared to be black or dark blue, with bright green engine cowlings. I don't recall, but I believe the tail may have had the same color green, almost neon, as the engine cowlings.
I believe United Airlines is the only airline to fly the 737 into GRR, with United (rare occasion) and Northwest flying the Airbus. It was spring break for a lot of area school so it's possible that it was a chartered aircraft, but being toward the middle/end of the week, I don't believe a charter would be flying then.
Is anyone aware of what flew into GRR, what airline the plane belongs to, and/or have pictures to appease my curiosity?