Footage posted on social media appeared to show a plane passenger racially abusing the woman and telling her “don’t speak to me in a foreign language, you stupid ugly cow”.
The incident is believed to have taken place on Ryanair flight FR015 at Barcelona Airport on October 19, before it left for London Stansted.
Essex Police said on Tuesday: “We have worked to identify both parties involved in this incident and passed the information to the Spanish authorities who are leading on this investigation.
“Our officers will continue to provide assistance where necessary throughout the course of this case.”
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The woman who was subject to the abuse said she felt “very low” about the incident.
Speaking to ITV News, Mrs Gayle, 77, from east London, said: “I feel very low. He pays his fare, I pay mine. So why did he abuse me for that? Because of the colour of my skin.
“If I had done that to him, I’m sure they would have called the police.”
Ms Gayle said her experience has discouraged her from flying with the low-cost airline in future.
She continued: “I feel really depressed about it. I go to bed and say: ‘what have I done?’“I haven’t done anything to attack him, it’s because of the colour of my skin I was abused like that.
“I decided I would not fly with that airline because they don’t treat you with no respect.”
Her daughter, Carol, who was with her mother on the Barcelona flight, criticised Ryanair’s response, and claimed they have not yet received an apology from the airline.
She told ITV News: “He should have been moved or taken off the plane and nothing was done.
“I know if that was a black person racially abusing an elderly woman the police would have been involved. It would have been a different matter.
“Nobody has apologised. We’ve not had nothing. We just want an open apology from Ryanair.
“I can’t even watch the video any more, it’s just so upsetting.”