I can't tell you how many people have given me dirty looks and said rude things to me about carrying Briz in her sling, because there has been news about babies dying in them. This may make me an irresponsible mother, but I don't care. It has been an absolute life saver for me. Briz loves it, and so far, she hasn't died yet, not even come close (she does however get kinda sweaty in it sometimes). I know that many people have said they are unsafe, but to that I say, those mothers are just stupid. Babies also die from blankets.
But yes, sad to say, she is about too big for the sling. I suppose I am just an impatient mother, because I can't handle a baby with no nap time. And I didn't think people on the plane would want to deal with the beast that Briz can be when no nap occurs.
I was a little nervous about her flying. The last time she did was when she was 7 months, and she is MUCH more mobile these days. But she did pretty well. She slept for about half the time, and then ate the other half (that's pretty much how her days run as well). She also loved staring out the window and at other people on the plane, which creeped people out a little bit. We lover our little sling sleeper/flyer.