The planes, scheduled for delivery in 2017, will use CFM International LEAP-1B engines.

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Boeing's instinct will be to stay in lock-step with CFM, which is currently the only engine supplier for the 737.

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The other engine is the Leap X, from CFM International, a joint venture between America's General Electric and France's Safran.

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"The letter is a positive affirmation of marriage, as is the Coalition for Marriage (CFM)'s online petition, " said a CES statement.

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Meanwhile, CFM International, a joint venture between GE and SNECMA which provides engines for more than 60% of Boeing's and Airbus's planes, is promoting a rival design called Leap-X.

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The CFM online petition has more than 470, 000 signatures.

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And how about those CFM pumps?

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