a highest vs an highest

Some examples from the web:

• This is one of the places where planetary scientists believe there is a highest probability of the detection of the first life off earth in the ocean that exists below there.
• 'Small power transformer' means a power transformer with a highest voltage for equipment not exceeding 1,1 kV.
• In February 2007... the rating agencies decided... to upgrade the banks... to a highest possible rate - AAA.
• 'Medium power transformer' means a power transformer with a highest voltage for equipment higher than 1,1 kV, but not exceeding 36 kV and a rated power equal to or higher than 5 kVA but lower than 40 MVA.
• Precautionary measures shall be taken in order to quantify a realistic highest residue level.
• To step onto the sand as a gladiator Is the highest position a slave can pray for.
• The military fighters had a - highest-performance military airplane was the SR71. It went a whole life cycle, got too rusty to fly, and was taken out of service. The Concorde doubled the speed for airline travel.
• - A wizard of the highest moral rectitude.
• It's only known to a few at the highest possible level.
• Varinius is a man of the highest regard.
• The highest is a little over eight.
• 45 cents a pound is the highest.
• This is a matter of the highest security, and therefore of trust.
• I have hired a PR agency with highest level contacts.
• The King demands your attendance on a matter of the highest importance.
• The Pluto-bel prize is the highest honor a scientist can receive.
• There's a leak at the highest staff level...
• A wizard of the highest moral rectitude.
• You're a lawyer of the highest caliber, Renfield.
• You are a gentleman of the highest order.

Some examples from the web:

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