The proper way to treat those up-front deposits would be as an "Other Current Liability" and we do see that as $69,452 on the last balance sheet. Assuming that all of that is pre-paid flight, we can fathom out how many "active students" that would translate out to.
One thing to note, is that number is about double current assets. So the cash is not being held in trust, it's being used to pay for day to day operations. Quasar owes the students more money than it has in liquid assets. If Quasar needed to refund student money, they would be forced to sell assets.