My last flight on Delta (Cinn. to Memphis), they upgraded me automatically (I have silver elite status) for free and were offering upgrades at the gate for anyone for $50. I have to say, though, that while there was more leg room and the perks are a little better. I don't know why they didn't take the opportunity to make the seats a lot wider. Putting the tray tables in the side arms and putting a larger center arm with metal on both sides actually seemed to make the chair more restrictive rather than more comfortable. It was a free upgrade, though, so I'm not complaining - just wondering about design thought process.