Y.S.
hi Jennifer, I flew on my own (without my husband) with my two kids last May. We flew to Europe (10 hr flight)and then flew 3 shorter flights within Europe.
I did not have a separate seat for my 18 month at the time. I had a seat for myself and for my 5 year old son.
On all flights, the flight attendants and everyone was extremely helpfull to me. They would ask the person sitting next to me to move to another seat, so I would have an empty seat next to my for my daughter to use.
(The people asked to move didn't mind - and it was better for them not to be sitting next to a little toddler)...
I did not have a car seat and I'm very happy I didn't.
It would just be an extra piece to drag around with you.
The airlines gave me a seat belt that attached to my own for the baby. I would hold her on my lap for the take off and landing with the seat belt attached to mine.
One thing I do recommend to bring is the stroller.
Stroller can be gate checked - you can bring it all the way to the plane entrance, collapse it, leave it right there and when you come out - it will be waiting for you. It's a big help to have the stroller at the airport.
As far as entertainment - I brought a lot of snacks, paci, water, and bought some new toys at the dollar store to keep her happy. She slept most of the way
anyway..
Also, bring as little with you as you can. I only had a backpack with diapers, food, and kids' stuff with me, plus the kids and that was enough. If I had to worry about some other things like extra carry on luggage, car seat etc, it would just make things more complicated....
My kids both did really well on all the flights.