The dart flight on the darts is the most vulnerable part, and because of that they will need to be changed pretty often.
The flights themselves are made of plastic, feather or rubber, they also needs to be removed every time you put the darts away. Luckily there is a lot of replacements available, and very easy to change when you understand the process.
Simply pull the old flight out of the shaft, throw it away, buy one extra. Don’t keep the old as a spare, try to have the darts the best way possible.
Bend the new flight, so the flights are at about 90 degrees to each other.
Then you simply slide the new flight into the slit on the dart.