Related Clues:

• On-screen plane?
• Radar echo
• Radar sign
• It's barely noticeable
• Brief upturn
• Control tower image
• Jet, to an air traffic controller
• Radar-screen sound
• Sound on classic Pong
• Anomalous rise
• Inconsequential interruption
• Dot on a screen
• Minor anomaly
• It may be on the horizon
• Sonar echo