Big Bus Boy: We've seen a few A-321s in DTW and MKE, which have a very small "European" flag by the aft door(s). These planes are some sort of lease by/to Ryan Air, from what I was told. They seem to operate non-stop to Cancun, Mexico.
Chatted once with the cabin crew at a gate in MKE. They wore young, good-looking and all wore yellow scarves. The Lead Pursuer kept quiet for a few moments when I asked her in her native language (remember yellow scarf...) where she was from (a bit suspicious or awkward?), then slowly admitted that she lived in a city which is near the Rhine River.
Hasta la vista.