London to Chicago BA flight declares emergency after dropping 28,000 feet
British Airways Boeing abruptly lost altitude over Ireland due to ‘technical issue’ and returned to Heathrow

TL;DR
- British Airways flight BA295 experienced a sudden and steep descent of 28,000 feet over Ireland.
- Oxygen masks were deployed from the ceiling during the descent.
- Pilots issued a 7700 emergency squawk to air traffic control.
- The plane made a U-turn and returned to London Heathrow, landing safely.
- The aircraft, a Boeing 777-200ER, is one of BA's older planes, delivered in July 1997.
- British Airways stated customer and crew safety is a top priority and is rebooking affected passengers.