Allegiant now has 3 planes, N127NK (DC9-21), N410EA (DC9-51), and N414EA (DC9-51). The -51's are used on the LGB-LAS flights. N127NK appears to be used for charters only. I shot N127NK at SJC a couple of weeks ago on a charter from TVL. I believe they have one more ex-TWA -51 on order that they should be recieving soon.
Golden Gate Airliners