Pilot Abandons Flight Over Marijuana Incident, Causing Significant Delay

A United Airlines pilot refused to operate a scheduled flight from San Francisco to Cancun, Mexico on Tuesday after a passenger violated regulations by smoking marijuana onboard, resulting in a nearly four-hour delay for travelers. The incident impacted flight UA1679 and prompted the replacement of the entire flight crew.

According to accounts shared online by passengers, the initial announcement cited “technical issues” for the departure setback. However, subsequent updates revealed that a passenger had been smoking marijuana within the aircraft’s forward lavatories. The individual was subsequently removed from the plane but remained on board for approximately 40 minutes while crew members assessed the situation and determined a course of action. Concerns arose regarding potential exposure to secondhand smoke among the flight personnel. As a result, all passengers were deplaned while a new crew was arranged.

The pilot’s decision stemmed from fears that exposure could trigger a failed random drug test, potentially jeopardizing their career. In an announcement to passengers, the captain reportedly stated they had “30 years left of [their] career at United” and were unwilling to “risk getting drug tested when [they] get to Houston.”

Passengers awaiting a replacement flight received $15 meal vouchers and access to refreshments provided by a snack cart in the terminal. The original departure time, scheduled for 8:50 am, was revised to an estimated 12:30 pm.

Aviation experts acknowledged the pilot’s precaution as understandable given stringent FAA drug testing regulations and airline policies that carry severe consequences even for inadvertent exposure resulting in a positive test. Gary Leff, a contributor to View From the Wing, noted that “virtually any detectable level of marijuana metabolite in urine is considered a failed test.” He further explained that a positive result could trigger a lengthy investigation, loss of certification, and limited protection from union representation without evidence of passive exposure. Pilots also have a professional obligation to self-report potential impairment concerns.

Online commentary regarding the incident varied widely, with some users expressing frustration at the disruption while others supported the pilot’s decision. Several commenters advocated for penalties against passengers who violate airline regulations.