A woman gives a demonstration of an ambulance drone with built in defibrillator at the campus of the Delft Technical University in Delft, Holland, October 28, 2014.

The small aircraft, designed by Alec Momont of the Delft Technical University, weighs some four kg (8.8 pounds) and can fly at the speed of 100 km (62 miles); quickly delivering a defibrillator to patients suffering from a heart attack.

A drone picks up a pair of shoes during a presentation by the Crocs footwear company in Tokyo, March 5, 2015.

Employees of German postal carrier Deutsche Post and visitors watch as a quadcopter drone arrives with a small delivery at Deutsche Post DHL headquarters in Bonn, Germany, December 9, 2013.

Deutsche Post tested unmanned deliveries of medicine to determine the viability of using drones for deliveries of small packages over short distances.

DHL is hoping to demonstrate that the technology is ready for real world applications despite regulatory challenges.

A quadrocopter remote-controlled DHL drone is being used to transport medicines from the harbor town of Norddeich, Germany to the small island of Juist, November 18, 2014.

Emirati men prepare to use a small helicopter drone to take lure up before letting their Falcons catch it in Abu Dhabi, United Arab Emirates, Febrary 3, 2015.

A national sport and rite of passage for young men, falconry is getting a modern twist.

A Falcon catches bait from a helicopter drone before returning to the ground with a small parachute on in Abu Dhabi, United Arab Emirates, February 3, 2015.

A national sport and rite of passage for young men, falconry is getting a modern twist.

Firefighters from the Fire Department of New York (FDNY) respond to a five-alarm fire and building collapse at 1646 Park Ave as a drone flies overheard in the Harlem neighborhood of New York City, March 12, 2014.

Drones film Imran Khan (3rd L), chairman of Pakistan Tehreek-e-Insaf (PTI) political party, as he addresses his supporters during the Freedom March in Lahore, Pakiston, August 14, 2014.

A videographer uses a drone as he takes a video of a model presenting a lingerie creation at the rehearsal for Eve's Temptation collection during China Fashion Week in Beijing, October 26, 2014.

An official of the Center for Research and Technology Volcanoes Development (BPPTK) releases a drone quadcopter to monitor activity from the Mount Sinabung volcano at Sibintun village in Karo district, North Sumatra province in Indonesia, February 4, 2014.

French high-tech venture Parrot's Japanese PR staff demonstrate a mini-drone, "Rolling Spider", equipped with four propellers, a camera and detachable wheel protector in Tokyo, August 12, 2014.

The drone can be controlled via a smartphone.

A boy wearing first person view (FPV) goggles flies a quadcopter drone he built himself near Rathen, Germany, October 24, 2014.

Inexpensive drones used for aerial photography are rapidly gaining in popularity.

A flag with Albanian national symbols attached to a remotely operated drone flies in the stadium during the EURO 2016 group I football match between Serbia and Albania in Belgrade, October 14, 2014.

Not everyone loves a drone: Serbian fans burn a NATO flag during a Euro 2016 group I qualifying football match between Serbia and Albania in Belgrade, October 14, 2014.

The Euro 2016 qualifying match between Serbia and Albania was abandoned after the drone carrying a pro-Albanian message was flown over the stadium, sparking violent scenes on and off the pitch earlier in the month.

Drones are used in Peru for scientific purposes to conduct research in agriculture and archeology, July 10, 2013.

A drone flies over vineyards of the Pape Clement castle, belonging to Bordeaux winemaker Bernard Magrez in the soutwestern French town of Pessac, September 9, 2014.

Magrez is the first winemaker to have bought a drone equipped with an infrared camera to determine the optimal maturity of the domain's grapes and thus harvest them at different times.

A drone flies over the archaeological site of San Jose de Moro as it takes pictures in Trujillo, Peru July 18, 2013.

In Peru, home to the spectacular Inca city of Machu Picchu and thousands of ancient ruins, archaeologists are turning to drones to speed up sluggish survey work and protect sites from squatters, builders and miners.

Players of ASM Clermont Auvergne rugby club take part in a training session at the Marcel Michelin stadium in Clermont-Ferrand, central France, as a drone films them for training analysis, February 19, 2015.

Edwin Van Ruymbeke, inventor and developer of the "Bionic Bird", a flying toy operated by smartphone, poses with the bird-shaped drone financed by participative funding in Marseille, southern France, November 6, 2014.

United Arab Emirates' Prime Minister and Ruler of Dubai Sheikh Mohammed bin Rashid al-Maktoum (L) and his son Dubai's Crown Prince Sheikh Hamdan bin Mohammed al-Maktoum watch an unmanned aerial drone during the Virtual Future Exhibition in Dubai, February 9, 2014.

The United Arab Emirates says it plans to use unmanned aerial drones to deliver official documents and packages to its citizens as part of efforts to upgrade government services.

A French firefighter holds an Unmanned Aerial Vehicle (UAV) (aka drone) of French Fly-n-Sense (FNS) company before take off near Mont-de-Marsan, southwestern France, July 12, 2012.

In the Landes forest region, FNS was testing an innovative forest surveillance system which will enable real-time monitoring of fire outbreaks and the development of flames in French southwestern forests.

The Massachusetts Institute of Technology posted a video recently that imagined the delivery of acceptance letters to prospective students by drone.

An employee of Japan's toy maker Kyosho displays the world's smallest drone "Quatrox" at the annual Tokyo Toy Show in Tokyo, June 12, 2014.

A flying sushi service tray known as the "itray", created using miniature remote-controlled helicopter rotor blades, is demonstrated by staff at a "Yo! Sushi" restaurant in London, June 10, 2013.

A drone used for filming flies near a crew member up on the mast of the Swedish yacht Ran at the start of the annual Middle Sea Race in Valletta's Grand Harbour in Malta, October 18, 2014.

Where there's a drone you need a drone catcher: A drone Interceptor MP200 (top) catches a drone DJI Phantom 2 with a net during a demonstration flight in La Queue-en-Brie, east of Paris, France, Monday, Feb. 9, 2015.

The drone catcher in France is a response concerns over dozens of drone flights over sensitive sites, mostly nuclear facilities; worrisome development in a country that gets the highest percentage of its energy in the world from atomic power.

A drone from Portela Samba School, 5th in the 2015 Rio's Carnival, is seen during the Champions' Parade at the Sambadrome in Rio, Brazil, February 21, 2015.

Somerville, Massachusetts partnered with a two-person company, Above Summit, to fly drones over public buildings to check for snow drifts, ice and potential roof collapses after a heavy duty winter, February 20, 2015.

Somerville Mayor Joe Curtatone said, "it provides real time information...and it alleviates the problem of sending people physically up on roofs so it's safer."

Mohan Bhagwat, chief of India's Hindu nationalist organisation Rashtriya Swayamsevak Sangh (RSS), attends a drill during their workers' meet as a drone flies overhead in the western Indian city of Ahmedabad January 3, 2015.

A drone, or Unmanned Aerial Vehicle (UAV), hangs above Vincent Rodriguez as he explains how it can be used to monitor field health at the FarmSolutions exhibit on opening day of the World Ag Expo in Tulare, California, February 10, 2015.

A drone flies overhead during day 1 of the 2014 Coachella Valley Music & Arts Festival at the Empire Polo Club in Indio, California, April 18, 2014.

Developer Christoph Kohstall shows the Nixie wearable drone camera powered by Intel's Edison kit at the 2015 International CES in Las Vegas. January 6, 2015.

The Nixie is a quad copter worn as a slap bracelet that takes photos when it flies in a pre-programmed mode then returns to the user.

Developer Christoph Kohstall shows the Nixie wearable drone camera on his wrist at the 2015 International CES in Las Vegas. January 6, 2015.