An itinerary is a detailed plan of a trip, outlining things like:
* Dates and times of travel
* Destinations
* Activities
* Accommodations
So, when someone says "as per itinerary," they are referring to the pre-arranged plan.
Here are some examples:
* "We will proceed as per itinerary, departing at 9:00 AM." This means they will leave at the time specified in their travel plan.
* "The tour will be conducted as per itinerary, visiting the Louvre Museum on Tuesday." This indicates that the Louvre visit is part of the scheduled tour.
It is a common phrase used in travel and tourism, particularly when confirming the adherence to a planned schedule.