An instrument landing system that guides arriving planes onto a runway at Los Angeles International Airport failed for the second time in a week Monday, delaying several flights, officials said.

The system malfunctioned just before 10 a.m. and did not come back on until about 45 minutes later, said Ian Gregor, spokesman for the Federal Aviation Administration.

The same system on the same runway failed on Aug. 7 for several hours, delaying dozens of flights around the country.

This time, arriving flights were delayed 30 to 45 minutes as air traffic controllers kept some planes circling over Los Angeles and reduced the arrival rate from 60 or 70 planes per hour to 46, Gregor said.

The airport has three working runways.