However, the spokesman did not specify whether it was a flight data recorder or a cockpit voice recorder of the nearly new Boeing 737 Max 8 jet plane that crashed into the waters of Tanjung Karawang shortly after taking off from Soekarno-Hatta airport.
But he was stuck in unusually rough traffic on the Cikampek toll road in Jakarta early Monday and didn't make it to the airport until 6:30 a.m., about 10 minutes after the flight took off.
"Tonight we will move as quickly as possible to download what is in this black box", Haryo Satmiko, deputy chief of Indonesia's transportation safety committee, told journalists.
"Because of the pan-pan call, we were told to hold off, circling the airport in the air", said the pilot, who declined to be named because he was not authorized to speak to the media.
Search and Rescue Agency chief Muhammad Syaugi has said he's certain it won't take long to locate the hull of the aircraft and its flight recorders due to the relatively shallow 30 meter (115 foot) depth of the waters where it crashed.
But investigators will look at everything from catastrophic mechanical failure and pilot error to weather conditions or unusual cockpit activity that could point to a hijacking or pilot suicide, they said.
Officials found a black box from that flight on Thursday and hope that it will provide answers to what happened.
"I cried when I heard the news because my friends were aboard the flight", he said as quoted by Antara on Monday.
Ningsi Ayorbaba weeps as she await news of her husband Paul Ferdinan Ayorbaba, a victim of Lion Air flight JT610.
Apple announces New MacBook Air: smaller bezels, smarter, faster, lighter
For now, there's Touch ID , much like on the MacBook Pro . but no Touch Bar. which should please some people if not everyone. Apple said the MacBook Air is the most-loved laptop from Apple, and the new Air is the flawless device for portable use.
Investigators are now focussed on retrieving the aircraft's second "black box". "What's the matter with this new plane", he said.
The recovery was relatively quick compared with past incidents.
Lion Air added that the Boeing 737 MAX 8 had a "technical issue" that was resolved before flight.
Commercial airliners are required to carry two boxes, one which records flight tracking data and another which records conversations from the cockpit.
But Lion's admission that the plane had an unspecified technical issue on a previous flight - as well as the plane's abrupt nosedive just 12 minutes after takeoff - have raised questions about whether it had any faults specific to the newly released model, including a speed-and-altitude system malfunction.
Search crews are using underwater sonar to look for the wreckage of a missing airliner that crashed off Indonesia with 189 people aboard, officials said Tuesday.
The Transportation Ministry has sent a letter to Lion Air and flag carrier Garuda Indonesia - the two Indonesian airlines that operate the MAX 8 - to carry out a "special" airworthiness test on their fleet of Boeing 737 MAX 8. President Joko Widodo had ordered the search and rescue effort to continue through the night. It will also assess the possibility of raising the ticket prices for flights run by low-priced carriers.
Relatives wait for the identification process of the victims at the main police hospital in Jakarta, Indonesia.
The 24-year-old staff member of the Ministry of Energy and Mineral Resources, whose body was not found intact, was identified by her fingerprints.