Can the SK636 or SK638 be shipped by air?

Yes, they can be shipped by air. The battery in them is suitable for air transportation.

Read more here:

• MSDS-DIAMEC-SLA-(By-air)-2012-R.pdf
• MSDS-DIAMEC-SLA-(By-sea)-2012-R.pdf
• MSDS(OREMA).pdf
• FAA-airline-passengers-and-batteries.pdf