Shadowing, Following Undercover
This page is the CodyCross answer for the clue below from Airport, Group 454, Puzzle 5 (Plane Spotting).
Question is: Shadowing, Following Undercover
and the answer is: TRAILING
Word Meaning:
TRAILING — (rail transport, of points and crossovers) That converge in the direction of travel.
Definitions from Wiktionary.