Related Clues:

• Irregularity
• Singultus
• Air traffic screen sight
• Minor setback
• Radar screen dot
• Setback
• It's monitored by an air traffic controller
• Attention-getter in the control tower
• Tiny bump on a graph
• Air traffic controller's concern
• Hiccup
• Radar notation
• Spot on the radar
• Radar image
• Breathe spasmodically