World 7 · Birds vs Planes · 14 min · PRO
Why big things fly fast
Wing loading and size
PRO · Flight School
World 7: Birds vs Planes is part of PRO
The first world of Flight School is free. PRO opens the other 23 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly