First UFO sighting by a pilot

According to Official Guinness Records,

The world´s earliest sighting of a UFO by a pilot occurred on 31 January 1916, when a British pilot near Rochford, Essex, reported seeing a row of lights, resembling the lighted windows on a train carriage, that rose up into the sky and disappeared.

For a complete list of 1916 records, please visit 1916 Guinness Records in United Kingdom.

Other United Kingdom records that might interest you:

• First tank
• Heaviest birth - triplets (ever)
• Oldest soldier to enlist in WWI
• Land-speed landmarks - first two-way record attempt
• First person to take-off from a moving ship