Talk about awkward.
The meeting between the two was reportedly the first time they've seen each other since their split almost three years ago.
According to sources, Kate's daughter Lila Grace spotted Pete as well. Reveals one eye witness:
"Lila was excited because she hadn't seen Pete for ages. She was calling her mum over but Kate and Pete stayed in their seats and just acknowledged each other.
They both looked extremely uncomfortable and spent the whole flight trying not to catch each other's eyes. When the flight landed Kate was ushered off and they did not speak."
At least they both acted like adults.
[Image via WENN.]