Renamed the Main.java test file
Renamed the Airport.java file

Moved the file to Main.java, and added the ability to specify the lock type for the Aircraft as a command line parameter. (Making 'C' the third paremeter creates a LockC, anything else or no parameter makes a LockB.)
Added comments to the Locks
Cleaned up; fixed makefile; added comments

Added comments and changed variable names in Main.java and Aircraft.java. Fixed the makefile after doing the renaming of files.