It isn't all that far-fetched, really. Venus is the brightest object in the night sky after the Moon.
... as to _how_ bright it can be - I was once in an area with dark skies, setting up my telescope just before sunset. After dark, I was taking in the beauty of the Cigar Galaxy and then looked up and behind from the scope. My eyes were assaulted by a bright light on the top of the hill behind, and I was cursing the idiot who had turned that light on, when I realized that it was Jupiter, freshly risen above the hill. Jupiter is not as bright as Venus.
On that night, Venus, had it been visible, would've been blindingly brilliant. Flying 10 Km above the ground, with no light pollution, I'm not surprised that the Pilot mistook Venus for an aircraft headlight.
It always shocks me how bright Venus is. A few months ago I was wondering what the hell that blinding light was, and even though I’m an amateur astronomer I was sure it had to be something artificial. My star app told me it was Venus, and i decided to see it in my telescope for the first time. So I lugged out the 4-inch refractor and no matter what I could not manage to make out its shape. It was supposed to be a crescent but there was too much glare. Next time I’ll try it with the moon filter :)
... as to _how_ bright it can be - I was once in an area with dark skies, setting up my telescope just before sunset. After dark, I was taking in the beauty of the Cigar Galaxy and then looked up and behind from the scope. My eyes were assaulted by a bright light on the top of the hill behind, and I was cursing the idiot who had turned that light on, when I realized that it was Jupiter, freshly risen above the hill. Jupiter is not as bright as Venus.
On that night, Venus, had it been visible, would've been blindingly brilliant. Flying 10 Km above the ground, with no light pollution, I'm not surprised that the Pilot mistook Venus for an aircraft headlight.
Edit: clarity