NEWARK - Two airplanes have again clipped wings at Newark Liberty International Airport for the second day in a row.

Authorities say a United Airlines plane was backing out of a gate Wednesday evening when it made contact with an Austrian Airlines plane, which was parked at another gate.

The incident comes a day after a United Airlines plane and a Lufthansa plane clipped wings while on the ground at Newark.

A spokeswoman for Chicago-based United said Tuesday that the United plane was at a stop when the empty Lufthansa plane made contact with it. A spokeswoman for Cologne, Germany-based Deutsche Lufthansa AG disputed that, saying its aircraft was parked when it was damaged.

No one was hurt in either incident.

Both incidents remain under investigation.

The Associated Press wire services contributed to this report.