The agreement includes plans for common maintenance and training on the A400M transport aircraft - which both countries are acquiring - and the possibility of France using the UK's air-to-air refuelling aircraft, when there is spare capacity and training.

BBC: Cameron and Sarkozy hail UK-France defence treaties

Many leases in the healthcare sector are long in duration and triple net, meaning the tenant is responsible for taxes, insurance, and common area maintenance fees.

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And because 80% of the parts were common to all three versions, maintenance and logistics would be simpler and cheaper.

ECONOMIST: The defence industry

This month, I'm going to discuss a relatively easy thing you can do to protect one of your biggest investments and avoid some of the most common surprise expenses -- track your car's maintenance and associated costs using Microsoft Excel.

CNN: Use your Mac to track your money

The agreement splits maintenance costs on home exteriors, the garage and common areas evenly among the three couples.

WSJ: Shared Backyards: Advice for Homeowners on Removing Fences to Create Bigger Gardens, More Space

The CarMD Vehicle Health Index points out common problems by brand, which may be important to know as you consider future maintenance costs.

FORBES: What That Dreaded 'Check Engine' Repair Will Cost You