flying with an infant

Amanda • FTM to Niklaus Eli 💚 Now second baby is on the way 💚💚 Due July 25th, 2023

I'm going to see my boyfriend and baby daddy because he is currently living in Ohio(we live in Florida) and can't come here until we get our new house. I will be flying with our 6 month old son for the first time and was wondering what advice you guys have for me?? any and all help is appreciated. it's a 2.5 hour flight and I plan on having him in my lap as I can not afford 2 seats.