With certain airlines (like Southwest) you get priority boarding if you are boarding with a medical device so that gives you time to get your machine on board and get it checked before everyone else starts boarding.
There are FAA regulations for medical equipment that benefit PD patients.
- The machine cannot be counted against your carry-on allowance
- The airline cannot charge a baggage fee for the machine or luggage that exclusively contains medical supplies
- The airline is liable for the full cost of the machine - normal "lost luggage liability limits" do not apply
I flew on many different airlines when on PD and found every one of them to allowed me to get on with the pre-boarding group when I explained my situation. I never had any of them take me up on my offer to show them the catheter.