I had a 40 hour nightmare of cancel flights, switching airports, delayed flights, and airport sleeping in my Sydney to LAX and then home in fall 2023. Wore my 4 inch booties for almost all of the time.
I have flown in heels many times in the past. I have stopped however if only for the fact that the altitude lower air pressure causes feet to swell some. I've flown 12 hrs from Brazil in heels, 5 inch loafers ( wish I still had these shoes) but in flight I had to remove them even though I untightened the laces. Not comfortable. My non heels were checked in so no changing.