My first job out of university was in avionics software, but that was back in the 90s. At that time, it was relatively poorly paid and mostly in ADA, but the latter, at least, has probably changed. I got a 50% pay rise when I moved on to my second job in a more commercial field.
On the plus side, we got to visit various places and poke our noses into whatever planes they had around at the time. And we got to laugh at the newly hired hardware designers when they put a transformer in the middle of a circuit board that was supposed to fly in a plane. The test guys loved putting those in their vibration rig.