Originally Posted by
wbl-mn-flyer
Oxygen concentrators, other than those we've approved, CPAP and BiPap machines will only be accepted if they have been tested by the manufacturer to comply with FAA safety regulations and display a label indicating that the machine is approved for use on an aircraft. Additional review of testing data must be provided to Delta for approval prior to travel.
DL, as a Part 121 carrier, is following the FAA guidance provided
here.