I supervised a study abroad program one summer, so I am voting for going through “official” channels in as polite a way as possible to get your D reticketed to end in Philadelphia.
I know it seems like a trivial matter to just have your D grab her luggage and leave when she gets to Philadelphia- but a staff person is likely going to lose his or her job when the “count” at the final airport doesn’t match up with the “count” when the group boarded in Europe.
Crazy? Yes. Your D is an adult. But these programs are specifically marketed as being run by the college and supervised by the college (even when they hire ringers- as I was- to supervise). Someone’s job is on the line here, whether or not that person is actually on the plane with the students, or just managing logistics from another location.
You can’t imagine how stressful it was dealing with every family’s personal issues- joining late, leaving early;kid shows up with $1K cash because “my parents don’t believe in credit cards-so here’s my spending money for you to take care of”; kid showing up with five different medications in a big ziplock bag, no prescription bottles or dosage instructions, nothing on the medical clearance form about allergies, should they be taken on a full stomach/empty stomach, are there side effects?; kid who refuses to do the prepaid meals with the group and then the parents go ballistic when they see the credit card, etc.
Do some nice, well meaning staff person a favor- get your D’s itinerary changed and approved in advance by someone with the authority to change it, and know you haven’t stuck the travel staff with one more headache which could end badly.
What if there’s bad weather and the flight gets rerouted to Montreal, with the final leg directly to the college? Is your D going to get off in Montreal and walk home? No of course not. But the airline has zero obligation to get her to Philadelphia, OR to help her rebook without it costing her $400 extra because she doesn’t have a ticket which allows her to get off in Philadelphia. The rules governing who pays for what (like the meal vouchers, hotel room, etc.) are pretty clear- and if you are going to mess with your ticket, you lose the protection of the airline.
And trivial matter- but if your D’s suitcase doesn’t make it onto the original plane in Europe, the airline is required to get it to the final destination. Period full stop. So that suitcase won’t go anywhere NEAR Philadelphia if the next flight out goes through a different city. And if the suitcase sits in an airport at her college city for two weeks, and eventually “disappears” the airline is not required to reimburse you for the contents- their obligation was to get it to that airport- and they’ll have a scan and photo showing that they did. Your obligation was to pick it up in a timely manner which you did not do.
Get her rebooked to Philly and avoid all these potential hassles!