There are 7 solutions. The longest is RTES with 4 letters, and the shortest is ARR with 3 letters.
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Yes, "ITINERARY ABBR." is currently trending (last update: 10 Jun 2026). Many solvers seem to find this clue challenging! Other clues with traffic peaks today are: tire out, Piglike mammal, DWELLED, Mexico's national flower and Genetic twin.
Solutions are between 3 and 4 letters long.