Egyptian fighter jets were seen accompanying the plane carrying Saudi Crown Prince Mohammed bin Salman as soon as it entered Egyptian airspace on Sunday.
Crown Prince Mohammed bin Salman is paying an official three-day visit to Egypt.
Prince Mohammed will hold meetings with Sisi, a key regional ally, and other officials in Egypt before flying off to Britain on Wednesday and then later this month the United States.
On Friday, Hariri and the Crown Prince appeared in a selfie posted on the former's personal Twitter account, apparently signalling relations have been normalized following last year's freaky sequence of events around Hariri's resignation.
HRH Crown Prince Mohammed bin Salman conveyed the greetings of The Custodian of the Two Holy Mosques King Salman bin Abdulaziz to President El Sisi.
Ties have grown between Egypt and Saudi Arabia since 2013 when Al Sissi led the army's toppling of Islamist president Mohammad Mursi following enormous street protests against his one-year rule.
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It is expected that issues regarding the upcoming Arab summit in Saudi Arabia in March will also be discussed.
Bin Salman's visit to Egypt is the first since he was appointed a crown prince in June 2017.
The Saudi Crown Prince hoped his visit will generate momentum to the strategic relations between the two countries and strengthen bilateral cooperation across all fields so as to contribute to enhancing Arab and Islamic unity and joint action in the face of the current threats to the nation.
He was received by Egyptian President Abdel Fattah El-Sisi and senior Egyptian officials at Cairo International Airport.
Egypt's constitutional court on Saturday voided contradictory lower court rulings on the controversial transfer of two islands to Saudi Arabia, state media reported.