What's going on with #AA135: American Airlines flight returns to Heathrow after 'medical emergency'

UPDATE #AA135 London-Los Angeles is heading back to Heathrow because of medical emergency. Track: http://t.co/mzKkQjAQr1 via @HuffPostUK

— AIRLIVE (@airlivenet) December 15, 2014

Twitter users are buzzing this morning about American Airlines Flight 135, which was headed to LAX, but has turned around and is apparently headed back to London’s Heathrow airport.

What now? RT @newvisionwire: BREAKING American Airlines #AA135 from London to Los Angeles is declaring an emergency.

— Talkative Rocker (@beewol) December 15, 2014

American Airlines flight #AA135 London Heathrow to Los Angeles has turned around and appears to be returning to LHR pic.twitter.com/0eWge9vKKr

— Michael Kelly (@Michaelkelly707) December 15, 2014

American Airlines #AA135 appears to be returning to @HeathrowAirport according to @flightradar24 – emergency believed to have been declared

— Simon Poulter (@simonpoulter) December 15, 2014

One report says the diversion is due to a medical emergency.

CONFIRMED: American Airlines #AA135 diverted back to Heathrow due to medical emergency pic.twitter.com/dJ045isdZr

— HuffPost UK (@HuffPostUK) December 15, 2014

We've been told that #AA135 is returning to Heathrow due to a medical emergency, a passenger onboard is ill

— Travel Daily (@TravelDailyHQ) December 15, 2014

Question:

#AA135 why is it going back to Heathrow and not landing in Glasgow

— Greg Pollowitz (@GPollowitz) December 15, 2014

Twitchy will monitor and continue to update.