An airline has 10 daily flights from philadelphia to denver. to assess customer satisfaction, a random sample of 15 passengers from each flight on a single day are asked to fill out a survey about their experience on the flight. what type of sample is this?

This would be a stratified random sample. Simply put, this method of sampling uses a portion of the population that is broken down into a smaller group that is called a strata. The strata are created based on shared characteristics or attributes of the members.