How come the slightest typo on a flight ticket means you won’t get on the plane/admitted into the country?

Question

Even correct spelled names in the in the wrong fields won’t do, like first name in surname and vice versa. Where does the problem occur? Cause you have like atleast 5 – 10 customs agents and flight staff manually watching your passport/ticket, and they should be able to conclude that the ticket is yours. Or?

In: 49

Answer 1

Just gonna quietly remember the time that my sister and I were flying from London to Seattle and the gate agent marked our boarding passes with correct names but identical birthdays… definitely a good way to cause a two hour delay while sitting on the full plane waiting to get moving…