Low-cost public carrier SpiceJet on Saturday said it has signed a $12.5 billion deal with CFM International to purchase 'LEAP-1B' engines for 155 units of Boeing '737 MAX' airplanes, along with spare engines to support the fleet. CFM International is an aircraft engine developer, with 50:50 ownership of US-based General Electric and France-based Safran Aircraft Engines. "The airline also signed a 10-year rate per flight hour (RPFH) agreement with CFM Services that covers all LEAP-1B engines powering SpiceJet's 737 MAX airplanes," SpiceJet said in statement here. Under the RPFH agreement, CFM International guarantees maintenance costs for all SpiceJet's LEAP-1B engines on a pay by hour basis, it said. "We are looking forward to introducing the new LEAP-1B into our fleet," said Ajay Singh, SpiceJet's Chairman and Managing Director, adding that LEAP-1B is living up to its promises for efficiency and reliability.