مناسك حج - مكارم شيرازى، ناصر - الصفحة ٨١ - Acts that are Haraam in the State of Ihram
١١- Going under the shade during travel
Article ١٣٢- A Muhrim man should not go under the shade during travel or keeps a shade or an umbrella over his head, therefore traveling with airplane or roofed vehicle and like them is not permitted for a Muhrim man, but it is permitted for women.
Article ١٣٣- Going into the camp or under the roof of stations in stations in middle of the way or in Mecca, Arafat, Mashar or Mena has no problem; also passing roofed markets and tunnels, which have been made for pedestrians, is permitted.
Article ١٣٤- Whenever a shade has no effect on preventing from sunlight and rain, men are permitted to go under that shade, therefore Muhrim men can use roofed vehicles or airplane from dawn to sunrise or in fully cloudy days, but using a shade on rainy nights has atonement.
Article ١٣٥- Passing bridges in the way and staying in the shades of vehicles has no problem.