IBM said that Air New Zealand's computer system crash for six hours could be due to failed oil pressure sensor on a backup generator.

The crash had caused disruption in services besides causing inconvenience to more than 10,000 customers of the airlines.

IBM said in a statement, "The likely cause appears to have been a failed oil pressure sensor on a backup generator. We regret any inconvenience caused to our clients or their customers."

The IT failure adversely impacted company's booking and check-in systems that caused delay in routine procedures and affected flight schedule. Meanwhile, the Airline apologized for delays and inconvenience to the customers. 

Rob Fyfe, the Chief Executive of Air New Zealand said that IBM should not hesitate for causing disruption in services. He added, "We were left high and dry and this is simply unacceptable."