Those two, plus
-Unrealistic flightplans in general (applies to commercial flights mainly)
-People who cross overhead the airport or call inbound 10 miles out at 18000’ or more… Resulting in doing l donuts around the airport trying to get down-there’s a solution for that at most major airports. It’s called a Standard Terminal Arrival-the charts are freely available to show what altitudes and speeds you should be at and where to be at them. These charts often will even take you right to the start of the ILS or to a downwind leg!
-People landing on RWY 09 @ KBOS-it doesn’t have an ILS in RW and you’d legit have to fly thru buildings to get there! 04L/04R or 15R if the winds that bad easterly folks!
-People with absurd callsigns that take forever and delay ATC info.
(Sierra Tango Oscar Papa India Tango 567890)