Cannot add aircraft of same type

[Nabeel]

You will need phpMyAdmin. Open it up, goto the phpvms_aircraft table. Click on structure, and scroll down until you see the "Indexes" section. There is an index on the "name" column, called "UNIQUE". Click the red X to remove it.

Indexes:   Keyname Type Cardinality Action Field

PRIMARY  PRIMARY 19       id 

name  UNIQUE 19       name   <<<<<<<<<

This usually happens if you missed an update, or just did a fresh install without refreshing the database.