Flight attendant Tommy Cimato explains what those annoying dings on an airplane mean. You hear them when you’re trying to negotiate space with the middle armrests. Two dings, one high, one low, are are the flight deck trying to call the flight attendants. Three of those? Well, that’s an emergency my friend! Hopefully, you’ll never hear that. Just one tone means someone is being needy and is calling the flight attendant, or needs help in the bathroom, yuck.