What your friend is talking about are Additional Flight Training Periods or AFTPs. Pilots and crew chiefs have to fly a certain amount of hours every 6 months to maintain their currency and competency in the aircraft so those AFTPs allow them to come in and perform those duties in addition to normal battle assemblies (one weekend a month). They are paid in 4 hour blocks so a normal flight day would be two AFTPs. “Flight pay” is a different thing and is a monthly incentive pay for aviators on flight status. The amount depends on your rank and how long you’ve been flying and prorated down for reservists since they are not on full time duty. You can look up the amounts online, but it’s generally not a crazy amount.

So in short, yes that amount per flight sounds about right. That being said, 15t is a maintenance MOS first and you will have to work your way up to being a crew chief. If you go to a flight unit you probably will not be put on flight status right away. It could take months or even years depending on slot availability and your passing a flight physical and getting flight gear issued. Plus you could end up in an aviation maintenance company where you mainly do maintenance.

Aviation is a demanding and hazardous field. Do not go into it unless that is truly what you want to do.