Subsequently the order was increased to 9000 units, with the option to produce 8000 more if the government needed them.

The first two of these were delivered in 1995, and the order was increased to 60 aircraft the following year.

This latter order was increased to 390 units in Summer 1938.

In October 2010, the order was increased by another six aircraft of that type.

But they've proved so popular with visitors, the order has been increased six fold.

This order was then increased by a further 500.

The order was increased to 75 aircraft with 67 eventually being delivered.

The order was later increased to a total of 26 trains.

On January 12, 2012, the order was increased to twenty-four episodes.

The option rights were later exercised, and the total order was increased to 32.