Why the two options look identical at first
Search for “dummy ticket generator” and you will find tools that let you type in a passenger name, flight number, airport and travel date. In seconds, they produce a polished PDF.
You can show friends what a potential route might look like without buying anything. The problem begins when the purpose changes from illustrating a trip to documenting a reservation.
A professional-looking file does not establish that an airline has held a seat or recorded your journey.
What makes a flight reservation different?
The International Air Transport Association describes Passenger Name Record data as booking information held by airlines. Its passenger-data toolkit notes that such records can include a name, itinerary and ticket indicator. That is the useful distinction: a booking record is data maintained in a reservation system, not merely a picture of a booking.
Airlines often provide their own ways to retrieve itineraries. Emirates, for example, has a Manage Your Booking page where travelers enter a last name and booking reference to view a trip. Not every reservation from every booking channel can be retrieved in exactly the same way, but a provider should be able to explain how its particular booking can be checked.