The Aircraft List is the first tab of the Status Information Window (menu item
Plugin > LiveTraffic > Status / Information...):
Shown are all aircraft that LiveTraffic has information about, by default including aircraft that are not yet displayed.
Above the list are filter options where you can limit the aircraft to only displayed aircraft, and where you can do a full-text search across all aircraft data. All columns are considered in this search, regardless if currently shown in the list or not.
The Action column offers the following buttons to do something with this aircraft:
Opens an Aircraft Information Window for this aircraft
Toggles camera view on this aircraft on/off
Toggles if the aircraft is currently visible.
2nd icon only shown if limits defined in the Cooperation settings.
Then, this icon toggles auto visibility.
See Hide an Aircraft for more background info.
Sort by any column by left-clicking on the column's header.
Change the order of columns by dragging the column header.
Select visible columns by right-clicking on the column header an selecting the columns from the pop-up menu:
The information displayed per aircraft is equivalent to the information in the Aircraft Information Window. Find there a detailed list of fields.