Are buttock implants comfortable when sitting for LONG periods of time (e.g., plane flights, long drives, etc.)?

I know we do not technically "sit" where the implants are placed. But how many of us really have good posture or sit with perfect posture at all times? So I am wondering if there is any discomfort from the implants when sitting for long periods of time such as a long plane flight or a long drive in a car or even a movie at a movie theater. Thank you.