The Boeing 737-800 plane was flying from Thailand to Muan, South Korea, on December 29 carrying 181 passengers and crew when it belly-landed at a South Korean airport and slammed into a concrete barrier in a fireball.
With the exact cause of the crash still unknown, Tuesday's unity move for a joint parliamentary task force came as transport minister Park Sang-woo offered to resign at a future date.
It also came after weeks of political turmoil, kicked off when President Yoon Suk Yeol briefly declared martial law last month.
"Our People Power Party and the Democratic Party... decided to establish a special committee," the ruling PPP said in a statement sent to AFP.
It would "discuss the investigation into the causes" and provide support to grieving families of the dead, it said.
The opposition Democratic Party also confirmed to AFP it had "agreed" to form a joint probe team with the PPP to look into the accident.
The 15-member team consists of seven from the ruling party and seven from the opposition, as well as one from neither, according to the PPP.
Minister Park told reporters Tuesday he would "act appropriately" over the disaster and was "discussing the proper methods and timing".
"As the minister responsible for aviation safety, I feel a heavy sense of responsibility regarding this tragedy," he said.
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The land, infrastructure and transport ministry spokesperson told AFP his comments were "the minister's offer of resignation".
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