“The number 13, black cats, breaking mirrors, or walking under ladders, may all be things you actively avoid – if you’re anything like the 25% of people in the US who consider themselves superstitious.
“…Superstition also explains why many buildings do not have a 13th floor … some airlines such as Air France and Lufthansa, do not have a 13th row. Lufthansa also has no 17th row – because in some countries – such as Italy and Brazil – the typical unlucky number is 17…
[source: https://theconversation.com]