Solo Air Travel with Toddler

Hi,

I am new to this site. It's very helpful! I am traveling by plane next week solo with my 1.5 year old toddler boy. For those who live in Canada we are flying with a charter called Sunwing. The flight is quite long at 5 1/2 hours so I am nervous about how he will make out. This will be his first flight. He will have his own seat and I am organized with the packing with new toys, books, games, a DVD player, snacks, extra diapers, wipes, etc. My big question is how do you go about changing diapers on a plane? Given the flights are long and in the morning I am sure I will be dealing with a messy # 2. Are there changing tables in the washrooms normally? If not, what have other parents done? I would appreciate any candid advise! Thanks! Also, what kind of changing facilities are in the airport?