Dan-Air Flight 1903 was a scheduled passenger flight that operated between London and Barcelona. On July 3, 1970, the aircraft, a Hawker Siddeley HS.748, departed from London and was headed to its destination in Catalonia. However, as the flight approached Barcelona, it encountered severe weather conditions characterized by low visibility and turbulence. The pilots faced challenges during their descent, which ultimately led to the aircraft crashing into the rugged terrain of the Les Agudes mountain in the Montseny Massif, just outside the village of Arbúcies.

The incident resulted in the loss of all 112 individuals aboard, including both passengers and crew members. The wreckage was found on the mountainside, indicating the tragically abrupt end to what was meant to be a routine flight. Rescue efforts were hampered by the difficult landscape and weather conditions, and the recovery of victims was both a logistical challenge and a somber endeavor.

Following the crash, investigations were launched to determine the cause of the accident. Factors such as pilot error and severe weather were considered, leading to discussions about aviation safety standards in Spain and abroad. This accident highlighted the importance of weather assessment and navigation technology in aviation, prompting some policy changes in how airlines manage flights during adverse conditions.