For various reasons we flew lots with my little one from three months old up until now, at three, when mum and her are flying 20 hours to join me in Oz. This included short hauls to the UK, mid hauls to Canary Islands, plus the occasional 10+ hour flight. Just make sure you have food and nappy requirements covered twice over. Imagine a five hour delay in the airport with shops shut. Layer the clothes as planes can be cold but destinations can be warm/hot. We (well, my wife) always (breast) fed at take off and landing to help with the ears, but have never had a problem. We also had milk powder and water and invested in bottle heater, which was way too hot so needed extra cold water to cool down. Six months old so you might be onto easier food options.
It is easier when they are younger, but a collection of books and of course the iPad help when they get older.
If they do cry, it's not great but 1) you can't hear it once you are a few rows away, and 2) on a holiday flight to Mallorca or similar, everyone has or has had kids so levels of understanding tend to be high.
Oh yeah, get a log book. We did that with our first ever flight - happened to be BA but sure others are available. We get this signed every time we fly. Josephine is now up to 30+ flights and 70000 miles. That'll grow significantly tomorrow...
Bottom line, don't stress it, kids pick up on that. If you and your partner are cool, them your kid will also be cool.
Oh yeah and EDIT always good to keep kids exposed to new stuff. Travel is good.