Jennifer Aniston allegedly changed her travel plans to avoid Angelina Jolie.

The 'We're the Millers' actress narrowly escaped an uncomfortable run in with her ex-husband Brad Pitt's fiancee by changing her flight, after learning they had both booked first class tickets on the same British Airways flight from Los Angeles International Airport (LAX) to London Heathrow on Sunday night (11.08.13).

A source told E! News that the actresses had no idea they were scheduled to take the same 11-hour flight until an airline employee got in touch with Jennifer's assistants to warn her about the potentially awkward situation.

The 44-year-old actress, who is travelling to London to attend the premiere of her new movie on Wednesday (14.08.13), subsequently decided to change her plans and flew out of LAX on Monday (12.08.13) instead.

Both actresses also usually stay at The Dorchester hotel in London but neither of them is staying there this week.

Jennifer, who is engaged to Justin Theroux, previously admitted she was heartbroken when her marriage to Brad broke down shortly after he filmed 'Mr. and Mrs. Smith' with Angelina.

She hit out at the brunette actress, who now has six children with Brad and recently had a double mastectomy, after Angelina shared details about how they fell in love on set.

She said: ''That stuff about how she [Angelina] couldn't wait to get to work every day? That was really uncool.''