CREATE TABLE table_54137 ("Rank" FLOAT, "Airline/Holding" TEXT, "Passenger Fleet" FLOAT, "Current Destinations" FLOAT, "Alliance/ Association" TEXT)

Which alliance has a rank of 40?
SELECT "Alliance/ Association" FROM table_54137 WHERE "Rank" = '40'
SELECT "Alliance/ Association" FROM "table_54137" WHERE "Rank" = '40'