A display system for a subject aircraft, comprising: a processing unit configured to receive air traffic spacing information associated with a lead aircraft and flight information associated with the subject aircraft and to generate display signals associated with the air traffic spacing information and the flight information, wherein the flight information includes a subject current position of the subject aircraft, and wherein the air traffic spacing information includes a spacing designation of the subject aircraft with a spacing target relative to the lead aircraft and a lead current position of the lead aircraft; and a display unit coupled to the processing unit and configured to receive the display signals from the processing unit and to render a horizontal situation indicator with spacing symbology based on the air traffic spacing information and the flight information, wherein the processing unit is configured to compare the subject current position to the lead current position to generate a spacing status and to compare the spacing status to the spacing designation to generate a spacing performance represented in the spacing symbology, wherein the spacing symbology includes a linear scale, the spacing target positioned on the linear scale, and an indicator positioned on the linear scale relative to the spacing target to indicate the spacing performance of the subject aircraft relative to the spacing target, and wherein the processing unit is configured to determine a spacing trend based the spacing status over time, and wherein the indicator of the spacing symbology represents the spacing trend with a point or apex of the indicator pointing in the direction of the spacing trend when the indicator is offset from the spacing target. a processing unit configured to receive air traffic spacing information associated with a lead aircraft and flight information associated with the subject aircraft and to generate display signals associated with the air traffic spacing information and the flight information, wherein the flight information includes a subject current position of the subject aircraft, and wherein the air traffic spacing information includes a spacing designation of the subject aircraft with a spacing target relative to the lead aircraft and a lead current position of the lead aircraft; and a display unit coupled to the processing unit and configured to receive the display signals from the processing unit and to render a horizontal situation indicator with spacing symbology based on the air traffic spacing information and the flight information, wherein the processing unit is configured to compare the subject current position to the lead current position to generate a spacing status and to compare the spacing status to the spacing designation to generate a spacing performance represented in the spacing symbology, wherein the spacing symbology includes a linear scale, the spacing target positioned on the linear scale, and an indicator positioned on the linear scale relative to the spacing target to indicate the spacing performance of the subject aircraft relative to the spacing target, and wherein the processing unit is configured to determine a spacing trend based the spacing status over time, and wherein the indicator of the spacing symbology represents the spacing trend with a point or apex of the indicator pointing in the direction of the spacing trend when the indicator is offset from the spacing target.