The Egyptian military said in a statement that despite its losses, its soldiers managed to return fire and kill 14 of the terrorists during the attack.
Six militants were killed in airstrikes on their hideouts, while 12 others died in a shootout with security forces, the spokesman said in a statement.
The military operation is centered in the Sinai Peninsula but also includes parts of Egypt's Nile Delta and the Western Desert, along the largely open border with Libya. It did not say how the other nine were killed.
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The army found and destroyed a training camp, which included a shooting range, an obstacle course and an underground conference room.
Egypt's President Abdel Fattah al-Sisi on Saturday extended Egypt's state of emergency for three months, the fourth time since it was declared a year ago, the official gazette said.
Since the ousting of ex-Muslim Brotherhood-affiliated President Mohamed Morsi, Egypt has seen growing waves of extremism washing over the society and spawning numerous deadly attacks.
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The authorities were hunting for one additional few children: Hannah Devonte, 15; along with Sierra. Investigators have previously said it's possible the crash was intentional .
According to the resolution, the Egyptian armed forces and police shall take all necessary measures "to confront the threats and funding of terrorism and maintain security throughout the country".
He said military forces engaged the attackers, killing the 14 militants.
Egypt's Sinai has witnessed many terrorists attacks since the January 2011 revolution.
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More than 100 jihadists and at least 22 soldiers have been killed in the wider-ranging operation launched on February 9, according to army figures.
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