As four more pieces of AirAsia’s Flight 8501 plane were located Jan. 3 in the Java Sea by Indonesia’s search and rescue agency, questions of coordination between the governments of Singapore and Indonesia on the commercial aircraft’s route schedule are now under investigation.

Bloomberg Businessweek reported on Jan. 3 that AirAsia may have violated light path rules on the day of the crash on Dec. 28. AirAsia was only permitted to fly the Surabaya-to-Singapore route on four days of the week, not including Sunday when the crash occurred, Indonesia’s Transportation Ministry said yesterday. Singapore’s Civil Aviation Authority contradicted that directive Jan. 3, saying the airline had been authorized to run daily flights during the winter season under a bilateral air-services accord.

“If AirAsia flew on a day when it wasn’t permitted, then the onus falls not only on the airline but also on the regulator,” Shukor Yusof, founder of aviation research firm Endau Analytics, said by phone Jan. 3 from Johor. “Somebody clearly didn’t do their job.”

The airline could fly between the two cities on Mondays, Tuesdays, Thursdays and Saturdays, according to the Indonesian ministry. The company was operating the flight on Mondays, Wednesdays, Fridays and Sundays, according to Singapore’s CAAS. AirAsia’s website showed all flights from Surabaya to Singapore as unavailable today (Jan. 3).

Bloomberg reported that AirAsia Indonesia Chief Executive Officer Sunu Widyatmoko confirmed the suspension of the route license and said the carrier will cooperate with an investigation, according to comments made at a press conference broadcast on local television Jan. 3. The company won’t issue a statement until the results of the government review are announced, he said.

The carrier has not responded to multiple comment requests by phone and email. Employees of AirAsia at Surabaya’s airport told Bloomberg News that the suspension would only be until Jan. 5.