[vonmoltke]

I know they bought one of the month-long ad campaigns in Penn[1], which could not have been cheap. I also see their ads in some subway stations.

[1] For those who don't frequent Penn Station in New York, the Hilton Corridor that cuts down the center of the station contains a few dozen billboards that represent pretty much the only non-public-service advertising in the station. Amtrak sells the entire lot of billboard space to one advertiser at a time, generally for about a month. Slack was up there a few months ago.