As far as I know, once you get a job and do it well, more work will follow as you develop a reputation for reliability.

The requests for airports that are not near where you live might be on the possibility that you do actually leave home occasionally and might just be in the vicinity.

I must say that when we need to hand deliver some item, we use members of staff or trusted contractors.

Tonight for example, I'm sending a guy to Congo with a toolkit to hand over to our agent, since it's needed offshore urgently as freight can take weeks to clear customs down there. That's not a courier job, since a visa is required. It also helps that this guy has been there before on a job and knows the agent.

In the past we have sent staff on hand carry jobs to California and Thailand. They are not always met at the airport but might have to drive or take transport to some further destination. The job is not done until the part is in the hands of the person who needs it. Our secretary was the one who went to our California office and was shown hospitality and taken on a tour by our staff there.

The warehouseman was the one who carried some pump seals to Thailand and came back with some "interesting" new social media contacts.

In the case of helicopter parts to Norwich, maybe they found a staff member who would do it. You need people who are covered by appropriate insurances etc.