Greedy captains who won't " let "you fly
Co pilots
Lets say you hire a C152 and go out for a trip with a fellow Pilot you know, who has some hours on that type and a lot less experience then you. You have hired the airplane and are the PIC, but your letting your friend fly today. You takeoff on a great sunny day, but when returning to the airfield the wind is gusty and weather is not great. Its within the limits of the plane....just.
Now are you telling me you wouldn't be thinking if he screws this up its my fault as I've hired the airplane. Thats kind of how it feels when a company gives you an expensive plane to Command. Its not yours but you know if it goes wrong your the one that will end up in th sh*t. A Captain can't always grab the controls so will have to trust your ability to handle the plane or as is easier sometimes, just do it themselves.
Do your job, listen and learn and earn their trust and you will get to fly.
Simple