To ship freight:

(a) By land (domestic shipments), use a bill of lading;

(b) By land (international shipments), you may, but are not required to, use the optional GBL;

(c) By ocean, use an ocean bill of lading, when suitable, along with the GBL. You only need an ocean bill of lading for door-to-door movements; and

(d) By air, use a bill of lading.

[65 FR 60061, Oct. 6, 2000, as amended at 75 FR 51394, Aug. 20, 2010]