The Boeing 747-400M (IATA: B74M), commonly known as the 747 Combi, is one of the most versatile versions of the iconic Boeing 747. Designed to carry both passengers and cargo on the main deck, it combined the comfort of a long-haul passenger aircraft with the flexibility of a freighter. This unique capability made it especially popular with airlines serving destinations where passenger demand and cargo volumes varied.
The 747-400M was based on the Boeing 747-400 and featured a large side cargo door behind the wing, allowing freight pallets and containers to be loaded directly onto the rear section of the main deck. A reinforced partition separated the cargo area from the passenger cabin, while additional fire protection systems ensured safe operations.
At a Glance
- Manufacturer: Boeing
- IATA Code: B74M
- ICAO Code: B744
- Common Name: 747 Combi
- First Flight: 30 June 1989
- Entered Service: 12 September 1989 with KLM
- Production: 1989–2002
- Aircraft Built: 61
- Typical Passenger Capacity: Around 250–300 passengers (depending on cargo layout)
- Maximum Range: Approximately 13,450 km
- Engines: Four turbofan engines
Why a Combi?
Unlike a standard passenger aircraft or dedicated freighter, the 747-400M allowed airlines to transport passengers in the front of the aircraft while carrying freight on the rear main deck.
This made it ideal for:
- Routes with strong cargo demand but fewer passengers.
- Remote destinations where freight was as important as passenger traffic.
- Seasonal operations requiring flexible cabin layouts.
- Airlines wanting to maximize aircraft utilization.
Depending on operational requirements, the aircraft could be configured for more cargo or more passengers. It could carry up to seven standard 10-foot cargo pallets or containers on the rear main deck.
Design Features
The Boeing 747-400M shared most of its design with the standard 747-400 but introduced several important modifications:
- Large cargo door on the left rear fuselage.
- Reinforced main deck floor for heavy freight.
- Fixed partition separating passengers and cargo.
- Additional smoke detection and fire suppression systems.
- Roller conveyor system for pallet loading.
- Digital glass cockpit requiring only two pilots.
- Winglets for improved fuel efficiency.
From the outside, the large cargo door behind the wing is the easiest way to identify a 747-400M.
Passenger Experience
Passengers on the 747-400M enjoyed the same spacious cabin found on the standard 747-400.
Features included:
- Twin-aisle wide-body cabin.
- Quiet upper deck seating.
- Long-range comfort.
- Large overhead storage.
- Smooth ride characteristic of the Boeing 747 family.
Most travelers were unaware that cargo was being transported directly behind the passenger cabin.
Operators
The Boeing 747-400M was operated by a relatively small number of airlines, including:
- KLM Royal Dutch Airlines
- EVA Air
- China Airlines
- Air China
- Asiana Airlines
- Garuda Indonesia
- Martinair
- Lufthansa (selected operations)
KLM became the best-known operator of the type and was also the last major airline to operate the 747-400M in scheduled passenger service before retiring the fleet in 2020.
Legacy
Only 61 Boeing 747-400M aircraft were built, making it one of the rarer variants of the 747 family. As twin-engine aircraft such as the Boeing 777 became more efficient and dedicated freighter fleets expanded, demand for combi aircraft declined.
Some former combi aircraft were later converted into full freighters, extending their operational lives in cargo service.
Technical Specifications
| Specification | Boeing 747-400M |
|---|---|
| Manufacturer | Boeing |
| IATA Code | B74M |
| ICAO Code | B744 |
| Length | 70.67 m |
| Wingspan | 64.44 m |
| Height | 19.41 m |
| Maximum Takeoff Weight | Up to 412,770 kg |
| Maximum Range | Approximately 13,450 km |
| Cruising Speed | Mach 0.85 |
| Engines | 4 turbofan engines |
| First Flight | 30 June 1989 |
| Entry into Service | 12 September 1989 |
| Aircraft Built | 61 |
Fun Facts
- The 747-400M is commonly known simply as the 747 Combi.
- It could carry passengers and cargo on the same main deck during a single flight.
- The aircraft’s large cargo door made it easy to distinguish from a standard 747-400.
- KLM became synonymous with the 747 Combi and operated the world’s largest fleet of the type.
- Although passenger operations have almost disappeared, several former 747-400M aircraft continue flying after conversion into dedicated freighters.