This cannot be stated strongly enough. The age of content is a bright line. "Almost at the age of consent" is not a thing, in the same way that "almost pregnant" is not a thing, and "almost stopped at a Stop sign" is not a thing.
Additionally, there is the issue of jurisdictions. Vixen keeps bringing up this spurious claim about differing jurisdictions having different ages of consent and that this somehow muddies the waters and makes what Maxwell did legal. This is just completely and utterly wrong. For example, at time of writing, the age of consent in the Philippines is 12*. However, that does not mean anyone can take a 12 year old girl to the Philippines for sex and it becomes legal. The jurisdiction of the trial court is the only thing that counts, and in this case, that is the US Federal court.
18 U.S. Code § 2423 - Transportation of minors
(a) Transportation With Intent To Engage in Criminal Sexual Activity.—
A person who knowingly transports an individual who has not attained the age of 18 years in interstate or foreign commerce, or in any commonwealth, territory or possession of the United States, with intent that the individual engage in prostitution, or in any sexual activity for which any person can be charged with a criminal offense, shall be fined under this title and imprisoned not less than 10 years or for life.
(b) Travel With Intent To Engage in Illicit Sexual Conduct.—
A person who travels in interstate commerce or travels into the United States, or a United States citizen or an alien admitted for permanent residence in the United States who travels in foreign commerce, with a motivating purpose of engaging in any illicit sexual conduct with another person shall be fined under this title or imprisoned not more than 30 years, or both.
(f) Definition.—As used in this section, the term “illicit sexual conduct” means—
(1) a sexual act (as defined in section 2246) with a person under 18 years of age that would be in violation of chapter 109A if the sexual act occurred in the special maritime and territorial jurisdiction of the United States;
So, Maxwell transporting a 17 year old to England where the age of consent is 16 does not help her in a US Federal court.
*its about to be raised to 16, and about time!