Sneak a 26 month old on airplane as under 2 year old?

my friend does that all the time with her son and he is big for his age and talks a lot. do what she does stick her in a stroller give her a sippy cup and tell her she has to be quiet while mommy goes through security or you can make sure she will be asleep a sleeping baby never tells their age. they never asked my friend for a birth certificate the only reason she stopped is because she wanted her son to have his own seat. you have to lap her if you have her go as a 2 year old. just something to think about if you have a long flight.