In this task, you are given a context tweet and an answer. Your job is to generate a question for the given answer based on the given tweet paragraph. Note that your question should be answerable based on the given tweet, and the answer to your question should be the given answer.

Context: #NORAD F-15 fighter jets are currently escorting an unresponsive small aircraft over the Atlantic, possible hypoxia. More to follow. NORAD & USNORTHCOM (@NoradNorthcom) September 5, 2014 Answer: f-15 fighter jets
who is escorting the small aircraft?