instruction:
Given a travel related situation, and given a specific question about the situation, summarize the question into a title
question:
I'm doing a house swap with another family, and as part of the logistics, at a certain point I have to leave my car for them, and they will pick it up a few days later. This happens to be in Newark, NJ, but the problem is pretty general.

We can't meet in advance to exchange keys, and I don't have a third party who could hold the key. 

Can anyone suggest a way to accomplish this?

answer:
How can I leave a car for someone if we can't meet in person?


question:
Our baby is too small to eat adult's food, so we bring our own baby food with us when we dine in a restaurant, which supplies us with a baby high chair.

I am wondering if it is rude to bring our own baby food into a Korean / Japanese restaurant in Australia?

answer:
Is it rude to bring our own baby food into a restaurant?


question:
What is the reason that when you book a flight between 2 destinations from an airline website (aircanada.com), the prices are much more than when you book the same through a discount website like cheapoair.com?

answer:

Why airline websites charge more money than discount travel websites