What’s the useful load on an AA-5? There were four adults in this plane?
per GROK:
For the Grumman AA-5 Traveler (the original AA-5 model), the typical useful load is about 929 pounds.
aopa.org
Key weight figures (standard configuration)Maximum gross weight: 2,200 lb
Typical basic empty weight: ~1,271 lb
Average useful load: ~929 lb
Average payload with full fuel (standard tanks: 37 gallons usable / ~222 lb): ~707 lb