Saudi Arabia has already upgraded Jeddah airport (JED) for Hajj traffic: https://en.wikipedia.org/wiki/King_Abdulaziz_International_Airport#Hajj_Terminal https

Saudi Arabia has already upgraded Jeddah airport (JED) for Hajj traffic: https://en.wikipedia.org/wiki/King_Abdulaziz_International_Airport#Hajj_Terminal https://en.wikipedia.org/wiki/King_Abdulaziz_International_A... with trains to Makkah (Mecca) and Madinah (Medina) on the Haramain high-speed railway: https://en.wikipedia.org/wiki/Haramain_High_Speed_Railway https://en.wikipedia.org/wiki/Haramain_High_Speed_Railway It's almost 900 km (560 miles) from Riyadh airport to Makkah, so it doesn't make sense to use RUH for the Hajj.