Hi Hula: Yes I've done ski condo vacations while on Phase 1 and I just took along enough packets to keep me on track. For the plane - take a dry packet of Peach Mango, or Pina Colada and your shaker cup in your carryon and get water from the flight attendant for a 'celebration' drink (sneaky protein snack). If you need to, use the unrestricted packets of crisps for crunchy snack. If your flight gets a meal, book a low carb or diabetic meal ahead if you can. (there will be less no-no food in that kind of a meal.) Or just bring HB eggs, pre-cut veggies, and a salad from the concessions in the airport. Better to not use the Restricted choices on your flight if you can as you are just sitting there and it could lead to the munchies - they tend to be desserty sorts of things anyhow and can add to that feeling.
Good your parents are going to be helpful. Offer to help with shopping, & cooking and you may have more control over the menu
And one last note... NO lechon! lol
Liana