Adding us to the list too - my ds' has had his epi his entire short 7 yrs. We've taken it on the plane with us several times with no issues. One of his epi's doesn't have a label on it either b/c he carries it in an epi belt around his waist - I carry the other one (in the tube with a label) along with the box of benadryl.
A suggestion - our allergist has a letter that she fills in his name that basically states ds' has life threatening allergies to nuts and must have his epi on him at all times and we take that with us when we are flying *just in case* Have never been asked to see it though.