We are hiding out with Gong Gong and Po Po (Grandpa & Grandma).
The 4.5 hour flight was tiring. It felt much longer when you compound all the other things, check-in, security, waiting for luggage etc. Castle was very restless and didn't nap on the flight. So I just kept feeding him to keep him occupied. Luckily the retired couple who sat beside us were more than accommodating. They even held Castle a few times and played with him. Castle, of course, was his usual giggly charming self which made things much easier. Even the flight attendants came by and took him for walks around the plane and I got a precious few minutes to myself.
A few things I've learned about traveling alone with baby...
Go on a big plane if possible. Check before booking a flight what kind of plane you will be on, the bigger the better, there will be more room to move around. Ask nicely at the gate if there are extra seats, you never know, you might get lucky. Try to get a bulkhead seat. Our bulkhead seat was awesome because Castle had enough room to sit at my feet to play. Bring lots of snacks for baby, especially things that would take a long time to eat. Give baby the safety card to play with, it's laminated and it's a brand new toy! Make friends with your seat mate and flight attendants. You will need someone to watch/hold your baby while you are going to the washroom. Throw the no TV rule out the window (if you have that rule). Castle really got a kick out of pushing on the screen. Bring an empty water bottle and fill it up after security or on the flight. Water bottle makes a great toy. If your seat mate orders a hot beverage, kindly ask them to move it as far away from baby as possible. And bring/buy food for yourself that will be easy to eat while holding baby, such as granola bars, sandwiches, crackers, veggie sticks etc.

We managed to arrive in one piece but I was exhausted, Castle conked out while we were waiting for our luggage. With one arm pushing our luggage cart and one arm holding Castle I couldn't wait to get home to have a good long nap. We both needed it badly. But as soon as we got settled, we went to our favourite place of free entertainment, the library.
Don't know about Castle, but I am in love with the graphics and colours in this book, Rosie's Walk.
Castle especially likes the Baby Faces book. It's in accordion fold which make it very easy for those little hands to open the pages. And real photos are always more interesting.