How's it irrational? You are boarding a plane, taking an actual flight that may crash. It's quite tangible. Granted you could just as easily be killed in the taxi on the way to the airport. That said, looking forward to holiday is what it's all about.
I just watched the disaster movie Airport this afternoon. Fifty years old so a bit dated but it all ends quite happily.
It's irrational because of the chance of it happening being so low. If you flew one flight every day then statistically you'd be involved in one incident every 55,000 years and you'd have a 96% chance of surviving it. So while yes it can happen it's so ridiculously unlikely that it's as rational as fearing that you are going to fall out of bed and die during the night (which is actually about 10 times as likely to happen as being in a plane crash (and surviving)
Well irrational in the sense that people do much riskier things without the same fear. Driving as you suggest which is a lot more likely to kill you. In fact I remember reading that Food poisoning, falling off ladders and lightening were more likely to kill.you than flying. God point about the crash though, most people aren't afraid of flying, it's suddenly stopping flying that worries them.
That crash in South Korea, they'd have been ok if they had sent them down a longer runway instead of one with a concrete wall.
Haha well religious people shouldn't be afraid of flying because death is just the transition to paradise.