Flew thru CLT this past Saturday and could see some America West painted RJS running up and down the alleyway between B and C concourses. Anyone have info on why they were there and what they were doing? Looked like maybe running some kind of proving runs, but MESA already operates in CLT so I couldnt figure it out. They were not at the Express terminal, but in the BC alley between 4pm and 5pm. Thanks.