The spelling aisle is singular.
The plural is aisles and the plural possessive is aisles' (e.g. The store changed all of its aisles' numbers to eliminate duplication.)
The plural form for the noun aisle is aisles.
The word aisle is a singular noun. The plural noun is aisles.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural of senior is seniors. The plural possessive of seniors is seniors'
The singular possessive of "ant" is "ant's" and the plural possessive is "ants'".
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.