According to C&D battery, makers of the great Dynasty battery, VRLA-AGM batteries are completely safe for air transport.
Yet, while these batteries are safe and will not cause the same risks as flooded batteries or Lithium Ion batteries, I would not recommend going through TSA security with a UPS and announcing you have lead ACID batteries underneath your burka.
Recently, even an experienced shipper questioned me on my UPS batteries. To assuage his fears I marked the air bill "Uninterrupted Power Supplies." But technically they should be marked as NMFC 063496 UPS System with DOT safe AGM batteries.
If you get stopped by Homeland security, ICE, FBI, FAA or other spook, remember UPS batteries are:
- "Battery, wet non-spillable, not subject to regulations" by DOT
- "Not restricted for air transport" by IATA
- "In compliance" with IATA/ICAO special provision A67