The global airborne ISR market is set to grow, according to a report by consultancy Markets and Research.

The market is forecast to grow at a compound annual growth rate of 3.88 percent between 2017 and 2021.

"Many countries are in the process of augmenting their maritime security capabilities to ensure that hostile and illegal infiltration do not take place in their territories," the report said. "At the same time, major defense contractors are enhancing or modernizing the existing airborne ISR systems (such as MPA, special mission aircraft, and UAVs) to cater to the global defense and security needs."

Other dangers include stealth technology and cruise missiles. "In addition, other prominent technical threats include unstable propagation of radio waves, stringent data encryption laws, and limited use of spectrum," the report said.

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