I read an article aobut this last night (someone posted it on my Attachment Parenting forum), and I was disgusted. I alwayed NIP'd, and would be so angry if someone threw me off an airplane for doing it. When a kid's got to eat...Plus, it is recommended that you nurse a child during takeoff and landing so their ears don't pop.
I hope Delta gets a landslide of letters complaining about this one.