Reynolds Number 

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We are very happy that our content which are actually created for Engineers are also reaching to School students. To address your question to calculate the Reynolds number for aircrafts, the most important thing you should keep in mind is the fluid properties you use to calculate Re at the actual altitude of flight. It can be as high as 30-40K feet above the sea level and the density and viscosity will be very different at such altitude as the air temperature will be very low. So you need to look into the property chart and get the correct numbers. Re= rho x V x L/ mu. Here L you can take a characteristic length representing the real aircraft geometry or its wing.