Transportation crossword #3 (level 2)

Across

2. 2 Very big boat. (4 letters)
4. 4 It floats and sails. (4 letters)
5. 5 Hot air makes it fly. (7 letters)
7. 7 It flies with a big rotor. (10 letters)

Down

1. 1 Two wheels with an engine. (10 letters)
2. 2 Trains stop there. (7 letters)
3. 3 It flies in the sky. (5 letters)
6. 6 Four wheels on the road. (3 letters)