I've heard Pull Me Under a couple times.......Surprised nobody's heard As I Am.........oh well I guess that's why it was called Greatest Hit......
Right after Train of Thought came out, I remember hearing As I Am on the radio, once. It was some kind of thing they did at 10:00 every night where they play a song from a new album, just to give it some air, so to speak. Cool that they still do things like that, but I don't think it ever made regular rotation.
Basically, everything you hear on the radio nowadays is decided ahead of time by some guy in a suit in an office in New York. DJs are hired for their voices and personalities, but don't have free reign to just play what they want as in the old days. For DT to get played on the air for anything other than a one-off or specifically during a time when requests are allowed, someone with real programming power has to decide that they're cool enough to be played on their stations. Bands used to send their new singles directly to DJs to try to get them play them; today I'm guessing that Roadrunner would have to schmooze execs from the big corporations, which seems like it would be much harder to do.