My two year old can spot a Jet flying over at 50,000 feet! (We live
under a victor airway from SAC to RENO) He can say airplane, but for
some reason he sticks to umm-umm??? He's been saying it for over a
year.

It is so cool to see him perk up, when he hears one flying over... He
goes, "ooooohhhhhh, umm-umm!!!"

Best Regards!