Actually, only twice the size. Actual solid seating, excluding the hillsides, is only 45,000. We only get to 55,000+ if all four hillsides are packed.
Well I was being a bit generous. There's a high school stadium in San Antonio that holds 23k, so that makes JTS - at least in terms of actual seats - only about twice the size of the biggest HS stadiums.
It's the fans that make the stadium, though, IMO. 100k sitting on their hands is way less intimidating than 50k passing out from cheering....