Why is "Airplane" the #1 song on Ultimate-Guitar?

I check the ultimate-guitar top 100 list every few days, and I've noticed that the song "Airplane" by Plain White T's has been the top song on there for like months. I've never heard this song on the radio nor have I heard anyone even mention it, yet it's got like 3x as many hits as the #2 song. Did someone hack the UG site or is this song like extremely famous in some other country?