I know that a/c can be subbed-BA are doing it at the moment with a 737 which from a pax pov is inferior to an Airbus . In several countries domestic airline travel is not close to international standards and people travelling should ensure their employers do a risk assessment. In her case the school probably does a risk assessment to take kids to the local park but not to expose a staff member to the vagaries of air travel in the 'stans.
Why on earth go to nowheresville place like she did for a relatively minor
business issue-i am sure the school wasn't depending on hordes of prospective students . There are still a lot of places in the world where travel and flying presents a significantly greater risk than in the developed world.