The aircraft is East.

The aircraft is West.

The aircraft is South.

 To communicate with the air traffic control tower

To coordinate ground movement at the airport

To provide weather information to pilots

To announce intentions and communicate with other pilots in the area

In controlled airspace

In uncontrolled airspace

In areas with high terrain or obstacles

In remote areas with limited access

The size of the airport

The location of the airport

The type of aircraft allowed to use the airport

The presence of an air traffic control tower

Both should alter their paths to the right

The airship

The sUAS

First-person view camera

Remote PIC diligence

Binoculars

Remote PIC diligence

Binoculars

First-person view camera

An aircraft on final approach to land.

A balloon.

An aircraft in distress.

concentrate on relative movement detected in the peripheral vision area.

systematically focus on different segments of the sky for short intervals (no more than 10°).

continuously scan the sky from right to left.

340 degrees.

160 degrees.

80 degrees.