Come on... It's 2:20!!!!!
Really, you have to relax! You are a grown man and father, sitting across the aisle for 2:20 with YOUR own child shouldn't make you freak out!?!? But anyway here's my advise: What I've observed very often is, the kids feel it when their parents are stressed. The relaxed parents (I've seen mothers traveling alone with two infants and a toddler no problem!!) just have a good time whereas the nervous ones are the ones with screaming children! And no, it's not that they are relaxed because of good kids/ stressed because of bad kids. It's still the parents that influence their kids and not the other way round! You will be absolutely fine, really there's nothing to worry about!