Many people were posting on social media about the sight, concerned that perhaps the plane was being shadowed by a fighter jet over security concerns.
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Not to worry.
In fact, officials at Ontario Airport say the Lear jet was simply capturing some video footage of the UPS plane for marketing purposes.
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Flight tracking websites show the delivery company's plane flew from San Bernardino, headed west to the coast and over the Channel Islands then turned around and landed at Ontario, for a total flight just under 500 miles, lasting almost 90 minutes.