MythBusters says it could happen:
Myth: An untrained civilian can be instructed how to successfully land a plane over the radio.
Status: Plausible
Description: Based off of multiple airplane movies, this myth posed a challenge to the Mythbusters because they could not afford to test it using real aircraft. Instead, they used a NASA simulator. For their first test, both Adam and Jamie decided to see if they could land a plane unaided. However, since both Mythbusters had no flight experience and had no idea what most of the instruments and controls did, they both were forced to crash land their planes. In their second runs, a licensed pilot give them instructions via radio. With this help, both Adam and Jamie were able to land their planes safely. However, even though the test was a success, the pilot pointed out that most modern planes are so advanced that their autopilot systems can literally land the plane by themselves, negating the need for a civilian pilot. This information, coupled with the lack of any recorded incidents, led the Mythbusters to declare the myth plausible.