Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Illness / Injury; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Overcame Equipment Problem; Flight Crew Landed in Emergency Condition
Aircraft
We took off; at high speed went passed a plastic bag blowing by; no odd indications. FA (Flight Attendant) called up at 1;000 ft saying they had a smell. We said call back if it gets worse; I checked back at 10;000 and 18;000 and smell was still in back. We elected to run smoke fume removal and we had a faint smell in front of something similar to burning plastic? At 25;000 and after consulting FAs; dispatch and [Flight Operations] we diverted to ZZZ; we used our masks and kept them on until final; air was clear for us and there never was any smoke front or back. [Medics] boarded and checked out passenger; FA's and pilots. We were fine; FAs went to hospital. We had several alternatives and elected the most conservative option that gave us time to prepare and get the appropriate services for our passengers and crew.Be ready for fogging masks and dealing with those. Having FO (First Officer) fly as we do in training works very well.
Right at takeoff; we smelled something uncommon. Checked lavs and ovens for fire (even though smell wasn't 100% like smoke). Informed pilots of smell and no source of smell. Smell did not disappear and continued to pour into cabin during the flight. Took oxygen. Diverted to ZZZ.Get an air quality sensor on all aircraft to fix this issue and keep crew and passengers safe.
Air Carrier Captain and flight attendants reported fumes and odor in the cabin causing illness.