The MORryde STP-216 StepAbove is designed specifically for Airstream trailers, including many Flying Cloud models. It fits doorway widths between 23-3/4" and 26-1/4" and threshold heights from 18" to 23-1/4". Your 2019 Airstream Flying Cloud 25FBT is likely within these dimensions; however, we recommend measuring your doorway width and threshold height to confirm compatibility before purchasing. This ensures the step system fits correctly for safe and convenient entry. You can order the MORryde STP-216 StepAbove from Elkhart RV Parts and save $5 with code ALIRVP.