Hearing the following conversation at lumbumbashi (and many other places....)
Lumbum TWR: xxx, cleared the LUB, descend to FL080.
xxx: umm, tower, confirm LUB is working?
TWR: negetive, negetive, LUB not working.
xxx: roger, so confirm then we are cleared visualy to the airport?
TWR: negetive, negetive, cleared direct LUB FL080!
xxx: (exasperated sigh) roger......