Some of the ex-ExpressJet ERJs are in the process of being sold. Not sure to whom, or whether they will go back into pax service, but this one could have been doing an engine runup prior to sale. Most of the XRs are UA-owned and going to CommuAir; this is a slightly older LR model and I don't believe UA is moving any more of them to C5.

I had business at IGM earlier in the year with another frame and it is a pretty interesting place for an avgeek. At the time, it was mostly regional aircraft from various operators in different stages of storage, plus a lot of derelict/partially scrapped older freighters, like A300s, DC-8s, etc. The operator there is Kingman Airline Services, Inc. and they are a good operation with quality people. I hope the injured worker recovers quickly.