(Reuters) - Boeing's ( BA ) West Coast factory workers walked off the job early on Friday after they unanimously rejected a contract, halting production of the company's best-selling 737 MAX jet.

The planemaker has more than 4,700 of the jets on order, with Southwest Airlines ( LUV ), United Airlines, and Lion Air the top three customers awaiting deliveries, according to aviation data provider Cirium.

Below is a rundown of some of the biggest known customers waiting for their MAX jets, as per Cirium data.

Airline Number of 737 MAX jets on order (all

variants included)

Southwest Airlines ( LUV ) 472

United Airlines 327

Lion Air 229

Akasa Air 203

Ryanair 190

Air India & Air India 156

Express

American Airlines ( AAL ) 152

SpiceJet 144

FlyDubai 127

Avolon 107

(Compiled by Shivansh Tiwary in Bengaluru; Editing by Sriraj Kalluvila)