What Are They Talking About??

Poetry....love letters.....rymes.....riddles.....raps. What are writers really writing about when they write raps or poetry? As a singer myself I know that our lyrics or sentences come from the heart and personal experiences. Today I have had the song 'Airplanes' stuck inside my head, so I finally purchased the song off of Itunes, however I keep wondering what Eminem & Hayley are talking about when they sing this song together. Love? Pain? Chasing your dreams? Disappointment? I have no idea. All i know is that for some reason this song is really sticking in my head and relates to me in one way or another. But how?!