Low-cost Irish airline Ryanair (RYAAY) is closing in on a deal to buy at least 150 of Boeing's (BA) 737 passenger jets, valued at about $13 bil. A contract could be signed in weeks, Reuters said, quoting 2 sources. Most of the 737s would be older models, which would let Ryanair, Europe's No. 1 discount carrier, buy them at a discount. A large order of 737s could help Boeing avoid a drop in production as customers hold out for a newer version 737 called Max, due to start flying in '17. Ryanair shares fell 0.9% to 37.77.