For the K4 conversions, as with the K2 aircraft, there was no facility of a forward freight door.

Forward Freight Agreement, seller agrees to pay for freight and bill buyer at a previously agreed price.

Because the K3s had a forward freight door this facilitated the insertion of five upper fuselage tanks in the main fuselage of the aircraft.

A forward freight agreement (FFA) is a financial forward contract that allows ship owners, charterers and speculators to hedge against the volatility of freight rates.

The International Maritime Exchange or Imarex is an Oslo-based exchange for trading forward freight agreements (FFAs).

The exchange provides daily freight market prices and maritime shipping cost indices which are used to settle freight futures (known as Forward Freight Agreements or FFAs).

In the case of the K2s, there was no forward freight door and it was required to dismantle a large section of the fuselage roof structure for the insertion of the five upper fuselage tanks.

Freight derivatives, which includes Forward Freight Agreement (FFA), container freight swap agreements and options based on these, are financial instruments for trading in future levels of freight rates, for dry bulk carriers, tankers and containerships.

It provides an independent clearing service for the registration of OTC Forward Freight Agreements (FFAs) for the most actively traded routes; thirteen dry and ten wet routes, as well as options on the four dry timecharter routes: Capesize, Panamax, Supramax and Handysize.