The absence of Row 5 on many aircraft is typically due to airline fleet standardization and "anchor" numbering rather than superstition. Airlines often operate multiple types of aircraft (e.g., Boeing 737s and Airbus A321s) and want to ensure that specific cabin sections start at the same row number regardless of the plane size. For instance, an airline might decide that Economy Plus always starts at Row 7 and Exit Rows always start at Row 20. If a smaller plane in the fleet only has four rows of First Class, the airline will skip Rows 5 and 6 so that the Economy section still begins at the "standard" Row 7. This allows frequent flyers to know exactly where their preferred seat is located without checking a different map for every flight and makes it easier for the airline to handle last-minute "equipment swaps" without moving every passenger's seat assignment. While Row 13 is frequently skipped due to superstition, the gaps around Rows 5, 6, and 15–19 are almost always a logistical choice to maintain consistency across a diverse fleet of narrow-body and wide-body jets.