"I", if using a pronoun. (I suppose there are always ways to avoid pronouns, but sometimes that is too tortuous or I can't think quickly enough for a way to avoid it.) As in, when responding to question from ATC about intentions, "I hope to manoeuvre to gain height to 3400 feet before heading north again". Avoiding it, but less grammatical IMHO, "Hoping to . . . etc."
Well, you did ask!
Chris N.