Prices for airline tickets change on average about once per month. This would suggest that airline ticket prices are

relatively flexible

Explanation:

Flexible pricing is when there is room for negotiation of prices of a product between the buyers and sellers.

So the price is prone to change in short amount of time.

Sticky price on the other hand tends to be non negotiable and the does not change over time.in the given scenario prices for airline tickets change on average about once per month.

So there is constant change of the price every month. Meaning the buyer can convince the seller to change his offering price.

The price is relatively flexible

answer; planning;

answer///the madrid protocol;