Computerization to simplify piloting, there will be more pilots. There will be more and fewer planes. Perhaps electric planes will appear and press cars from regional passenger, and possibly cargo transportation.
Most likely, supersonic passenger aircraft will appear again, but since the cost of flights and operation will be higher, they will not receive significant distribution.
And classic aircraft will become more reliable, more economical, quieter, that is, the characteristics will be grow.
The same as now.
50 years ago was the first flight of Boeing 747, it is still in service.
From combat f15 flies almost 50 years, b52 almost 70.
Technologies have already been worked out, they have come up with very little new