See what that National Geographic article wrought?
So what might be interesting? Again looking at sequential March data only, some solid jumps in the employment in local "Leisure and Hospitality industries". Looks like this.. again just plotting March of each year:
So the local hotels are happy I am sure. It is interesting in that in the past you would sometimes see this factoid of high 'tourism' related employment in the region. It was true, but it was also reflecting the impact of the USAirways hub across a number of industries which would typically be thrown into that metric. So it was not quite the same 'tourism' impact in that it was not necessarily folks coming to visit Pittsburgh itself. Yet now the hub is kaput and the 'travel and leisure' job counts are pretty solidly going up. So there you go.