“pay an extra $1200 (every time you fly)”
If it is actually asur, you would pay an extra $12,000 every time you fly and you would not object to it, because we rejoice at fulfilling mitzvot regardless of the cost.
“Do you object to a person asking to switch seats because of a sensitivity?”
No, but I would object to a person delaying a flight for 45 minutes when he/she doesn’t get his/her way.