How would you weigh a plane without scales?

measure the pressure in each tire, and the contact patch size of each tire, then it's just arithmetic.

Weight on each tire (in newtons) = pressure in pascals x area in square meters.

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Here are some ideas ive come up with because i will be flying soon as well, 1. SLEEP (sleeping pills work) 2. Music player such as ipod or mp3 player 3. Read a magazine or book 4play with playdough ( before you leave on your flight make a list of rabdom things, the.pn try to create the with playdough) 5. Brush your hair ( whenever i get bored i alway brish my hair or try new hair styles) 6. If you flying with someone play games like flash 7. Bring cards 8. Try to remember every thing that you packed (make a list) 9. Play any game on yoir phone or ipod 10. Bring paper and try to do origami 11. Start a journal or auto biography 12. bring colored pens or markers and tatto yourself 13. Print out logic puzzels 14. Try to make upa secret code 15. Tell people you are older than you really are 16. Draw or scetch 17. Try to count to 1000 18. Try to write your name using 25 different fonts 19. Think about stuff 20. Come up with your top 50 baby names

The best, as I recall, is to land the plane on a boat. Knowing the water line of the boat without the plane, and then the water line with the plane, you can determine how much water is being displaced and use this to calculate the weight of the plane.