; (ii) less than 400 feet above the ground; (iii) during daylight conditions; (iv) within Class G airspace; and (v) outside of 5 statute miles from any airport, heliport, seaplane base, spaceport, or other location with aviation activities. 45505. Special rules for certain unmanned aircraft systems (a) In General Notwithstanding any other requirement of this subtitle, and not later than August 12, 2012, the Secretary of Transportation shall determine if certain unmanned aircraft systems may operate safely in the national airspace system before completion of the plan and rulemaking required by section 45502 or the guidance required under section 45504. (b) Assessment of Unmanned Aircraft Systems In making the determination under subsection (a), the Secretary shall determine, at a minimum— (1) which types of unmanned aircraft systems, if any, as a result of their size, weight, speed, operational capability, proximity to airports and populated areas, and operation within visual line of sight do not create a hazard to users of the national airspace system or the public or pose a threat to national security