Customers flying on Air India flights to North America and Europe have been raising issues about frequent delays, broken seats or non-functional in-flight entertainment screens as the Tata group struggles to revamp the airline's fleet, some of which are 15 years old. The original aircraft for the delayed flight to San Francisco, had developed a technical snag. So, the airline had to tow a Boeing 777 which was parked under hot sun in Delhi’s 49 degree temperature. Air conditioning system in plane work.