Magneto Optic Imaging technology has made major contributions to the nondestructive inspection of aging aircraft for cracking and corrosion.  The MOI was developed for imaging anomalies in ferrous and non-ferrous materials using magneto-optic visualization.  The MOI produces real time images of surface and subsurface defects and subsurface corrosion in metals.  Major aircraft manufacturers have approved the technology for use.  The US Air Force and Navy, major airlines and maintenance facilities are using the MOI for inspection of their aircraft.  It is also being used in inspections for hidden corrosion in various aircraft skins and coverings such as de-icing tape.  This non-destructive testing method gives the inspector the ability to quickly generate real-time eddy current images of large surface areas.