In my area I commonly hear the crew of some of the smaller airlines (cargo and passenger) report back after takeoff to the FBO that handled them. There are various pieces of information but haven't really listened well enough to write it all down. I do hear such things as the lift off time, the eta at destination, the number of passengers if it has any, what sounds like engine temperature (twin prop planes) and something called "uplift". At the moment it is uplift that I am asking about. Anybody know what that is?