I recently booked a flight through justfly.com.

I have checked with the airline and gave them my confirmation number and they were able to look up my itinerary and assign me to seats. This is my complete itinerary, though a few legs are operated by other airlines. I have heard some horror stories about Justfly. I'm not horribly worried, as most of them have to do with people trying to change their itineraries (something I never do). Nevertheless, I do have some concerns, as some people have had problems when the airlines changed one of their flights.

Beyond what I have done, short of buying a second ticket, is there anything I can do to cover myself in case of a mishap? Is there any information I could get from the airline to allay my concerns.

Thanks for any help or information.