For substances where this variation is identified in column 6 of Table 3-1, the following provisions apply:

1. if A1 appears in column 7, the substance may not be transported to, from or within the United States aboard a passenger aircraft without the prior approval of the appropriate authority of the U.S. (see US 1);

2. if A2 appears in column 7, the substance may not be transported to, from or within the United States aboard a passenger or cargo aircraft without the prior approval of the appropriate authority of the U.S. (see US 1);

3. prototype lithium batteries and cells transported in accordance with Special Provision A88, lithium cells or batteries including when packed with equipment or contained in equipment transported in accordance with Special Provision A99, and organic peroxides and self-reactive substances that are not identified by a technical name in 49 CFR 173.225(b) may not be transported to, from, or within the United States aboard a passenger or cargo aircraft without the prior approval of the appropriate authority of the U.S. (see US 1).