The tax is not really 35% (deduction on the gross of $478/month and $191 per dep). It works with brackets:
$217 taxed at 5%
$217 at 10%
$348 at 15%
$608 at 20%
$869 at 25%
$1,217 at 30%
Above $3,476 at 35%
The good new is that it's not likely that you will reach the middle bracket these times: Salaries are indexed on flight hours.
As it is now the cap from CAAV on airlines flights is as this: Vietnam Airlines can operate 28 flights/day, Vietjet 20, Pacific 3, Bamboo 11 and Vietravel 1. I let you count how many pilots are required to fly that.