True but if it is rationed for cadets it is most likely also rationed for ordinary citizens. Hard to imagine that cadets are worse off than civilians.
The other options are that you have to pay for it or that you have to rationalize your demand for a transport in some bureaucracy and in my opinion they to do not sound very Trek-ish.
The UFP alway struck me as a European Union/NATO type of grouping. The individual planets in UFP do have a lot of autonomy just like the states in the EU. Maybe the UFP helps with technology, planetary defense and gives assistance in emergencies but the planets are free to run their own affairs. Perhaps the UFP constitution help guarantee each planet's autonomy.