what made the woman in the control centre look at the narrator strangely

The woman in the control centre looked at the narrator strangely because he asked her about the black aeroplane that had guided him through the dark clouds and helped him land safely. However, she found this puzzling because there was no other aeroplane flying that night except the narrator's plane. The radar showed only the narrator's plane, and the woman had neither seen nor had contact with any other plane. This surprising situation made the woman give the narrator a strange look and laugh, as his question seemed preposterous given that no other plane was detected in the stormy weather except his Dakota. Essentially, the woman looked at the narrator strangely because no other plane was supposed to be in the sky, making his inquiry about the mysterious black aeroplane bewildering to her. This is from the story "The Black Aeroplane" where the narrator's experience was extraordinary and mysterious.