'Journey' can be a useful expression, either for a literal travelling experience, or perhaps for a personal 'voyage of discovery' sort of concept, but it's most definitely overused now. The airport management might have had reason to look at the 'passenger journey' for its own analysis (wait times, choke points, maximising shopping uptake, that sort of thing) but that needn't and shouldn't translate into something the public actually has to read or see. For passengers, it's less of a 'journey' and more a 'test of endurance'. Calling it a journey just makes it worse.