What types of questions can I ask for market research?

I'm preparing interview questions for research, my candidates are people who have traveled by air accompanying an infant. The purpose of this research is to find out what makes them buy a ticket for certain airlines or from or to a certain airport. For example, facilities/services they provide or the price... show more I'm preparing interview questions for research, my candidates are people who have traveled by air accompanying an infant. The purpose of this research is to find out what makes them buy a ticket for certain airlines or from or to a certain airport. For example, facilities/services they provide or the price etc.

What type of questions can I include in my research?
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