FAA Federal Aviation Regulations (FARS, 14 CFR)

No pilot may operate an aircraft penetrating an ADIZ under DVFR unless --

(a) That pilot reports to an appropriate aeronautical facility before penetration: The time, position, and altitude at which the aircraft passed the last reporting point before penetration and the estimated time of arrival over the next appropriate reporting point along the flight route;

(b) If there is no appropriate reporting point along the flight route, that pilot reports at least 15 minutes before penetration: The estimated time, position, and altitude at which he will penetrate; or

(c) If the airport departure is within an ADIZ or so close to the ADIZ boundary that it prevents his complying with paragraphs (a) or (b) of this section, that pilot has reported immediately after taking off: the time of departure, altitude, and estimated time of arrival over the first reporting point along the flight route.