Answer:
Jet planes.
Step-by-step explanation:
Elastic supply is a measure of the relationship between the quantities of a good supplied and change in prices. As it is expected that a change in change in price will affect the quantity of goods demanded and supplied , elastic of demand measure this relationship.
However , elastic supply occurs when the percentage change in quantity supplied is greater than the percentage change in price.
Airplane can easily be substituted with options like train , vehicles and even boat ,therefore change in price could trigger a greater effect on the supply