I have (was necessary as I was pregnant and then breastfeeding so I had to find another way).
I have a very useful book - ask a pilot. I listen to the fear of flying audio book which has some useful grounding exercises to center yourself if your mind is running away with you.
I have some music ready to go which makes me want to bounce around in my seat - Bat out of Hell (short version) is my go to take off song. I play it LOUD in my headphones, and again if I feel nervous in turbulence.
I choose an aisle seat. I found not easily being able to see the windows I wasn't as focused on where I was. Sometimes looking out at the stuff we were flying over made me feel queasy (shame really, as I could also appreciate it was very beautiful).
I choose airlines I know and trust, even when paying a bit more. British Airways, Virgin, Quantas etc
I look up the planes and avoid Boeing as I don't trust them anymore.
I try not to focus on the flight much, if I start to think about it I'll switch my thoughts to the wonderful place I am going to instead and try and feel excited about that instead.
I look at the staff who work on the planes and remind myself this is probably the second flight they have done today, this is the same as riding the train to the office for them, they understand better than I do that this is a safe, secure, benign thing to do. I look up stats about how many flights take off and land at Heathrow every day.