Flying far can be boring. Add minigames to make it fun!

• Turbulence from the occasional weather that slightly throws your aim off, so you have to compensate (needs testing to make sure is not annoying)
• Heavy lightning storms you might want to circle around instead of just flying A to B
• Flocks of birds you can aim for to get a nice red mist. Or fly around like a normal person.
• Vent heat at regular intervals to ensure optimal operation of ship (add manual heat vent block - late game add automated heat vent)
• Some kind of quick time events to get a temporary speed boost from your engines.
• Rare solar storms that shut down your ship and you need to complete simple minigame to restart the systems. Not on planets.
• Rare space debris / micrometeoroids - activate weapons, enable shields, or turn your ships hardest face toward them
• Complete simple challenges (think lockpicking in space), to get random rewards. Youd pick up these challenges randomly while flying ("Encrypted signal detected, plz solve"?).
• Collect precious space gas by flying through small space clouds along your route (a little deviation here and there). Add gas collector block to do it.
• Explore asteroids along your route for rewards by simply flying close enough. Maybe need to use a scanner block to do it.
• Random AI enemies to either shoot at or run away from. Nothing too harmful.
• Randomly generated meteor strikes on planets, with resources worth deviating from plan for.

Each thing alone needs to be rare to not be annoying. But if there are enough different ones, together they will provide enough entertainment for the longest journeys through space/air.

If you have more ideas, please comment.