S7 is a Russian airline so not one that I normally get to see.  Tokyo is the only place I have seen their planes in operation.  They have a bunch of 737 Max jets on order.  I saw one of them in a Boeing test bay on the west side of Renton one evening when passing by.  The bright green colors are hard to miss.  Fortunately, it was not long after this that I was at Boeing Field in the evening when the jet came in from a test flight.  The light was pretty nice by that time of day but I don’t think it would have mattered with a color that vibrant!