Whether helicopters are owned by the military or privately owned they can be used in rescue missions or to distribute aid. Helicopters are imperative in rescue situations, they can be used to distribute air bombs and can also land any where with a good surface. After Hurricane Katrina hit helicopters were used to “ search for survivors”  in the wreckage. In a bid to control flooding “the . Army Corps of Engineers planned to use helicopters to begin dropping 15,000-pound sandbags into breaches in the city's levee system”  .
Railway transportation had a growth of one billion tonnes.  The air traffic kept constant at million tonnes. The inland navigation decreased by percent to 221 billion tonnes. By contrast the maritime transport carried about 298 tonnes of goods which was an increase of percent. Also on the rise was pipeline transport which rose clearly to million tonnes. In 2015 overall the transportation of goods increased by percent. This was due to long transport routes. From 2001 to 2015 the average transportation distance had a direct impact to the transport services. 
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