They are often published by airlines for informational purposes and are of use to passengers for selection of their seat at booking or check-in.
The accuracy and editorial independence of specialised websites showing seat maps have also been questioned.
As a result, SeatGuru has received some criticism for presenting seat maps which are inaccurate and for which no one from the company has travelled on the aircraft;[3] for example, showing bars on aircraft where there are none (on the Singapore A380) or seat rows that do not exist (on the Emirates A380) or airlines that do not exist (like Skylanes, which the website says is based in Chicago).
One notable exception to this is Delta Air Lines, which uses sequential letters regardless of cabin layout on all aircraft (AB-CD-EF in business class and ABC-DEF-GHJ in economy).
British Airways is less superstitious, and their seat maps for A320 aircraft show a row 13.
Delta Air Lines also includes row 13 in many of their seat maps.