We traveled to Hungary with my (then) 10 month old daughter. The flight there was a nightmare since I was alone with her, in a very cramped seat and she refused to sleep for about 20 hours straight (even though it was a night-flight). Whenever she would finally pass out either at the airport in Amsterdam or on our second flight from Amsterdam to Budapest, something would promptly wake her up after 20 minutes. I have no idea how she did it, but I nearly died of exhaustion since I had her in a baby carrier on me the ENTIRE time-on the transatlantic flight and at the airport. Looking back, I should have just stopped trying to get her to sleep so hard, but I felt like she was going to have a meltdown wtihout sleep. Alas, I was wrong.

Also, since my husband wasn't next to me, I didn't have the option of releasing her out of my lap for even a moment. When I booked my tickets months earlier, I didn't count on her getting so big by the time our trip came up.
On the flight, we were offered a bassinet that hangs on the wall in front of you in bulkhead, but there was NO room for it so I just declined to have it. Plus I seriously doubt she would have slept in that!
On the way home, she was a month older (we were in Hungary for a month) and did really well, but I also had my husband with me. The toughest part was having to entertain her the whole time. Also, she was just crawling at the time, so she would crawl up and down the isle which no one seemed to mind. I think an older kid may annoy some passengers, but so what?
I think that since your baby is older, some new toys would provide lots of entertainment. My daugther loves sticker books and puzzles. Just make sure you bring stuff that they haven't seen before. Good luck!!