Also keep in mind that there are different tickets for different circuits with a different duration. (dosmanosperu.com)
This is a common courtesy among airlines that will transfer checked bags for you even if on different tickets, but it adds an extra layer of complication and liability on the airlines. (rewardexpert.com)
Our tickets were inspected by several different ticket inspectors and not one of them mentioned anything to do with us not being welcome on the so - called local train. (findingbeyond.com)