Anti-war campaigners, who have set up camp outside a military base in Suffolk, say they will stay "for as long as it is sustainable".
About 30 people have set up "peace" camps at RAF Mildenhall and RAF Brize Norton, in Oxfordshire.
US flights landed at Mildenhall last month to refuel on their way to Israel.
The Campaign for Nuclear Disarmament has said the aircraft were carrying "hazardous" cargo and is monitoring flights in and out of the base.
"When these flights landed at Mildenhall a couple of weeks ago everybody said we had to do something," spokeswoman Mell Harrison said.
Base 'quiet'
"We plan to stay here for as long as it is sustainable.
"It could be weeks, it could be months, it could be longer.
"The base has been very quiet. The police have been very friendly and supportive and local people have been dropping in to find out more about the crisis and understand more themselves."
Miss Harrison said peace campaigners remained at Prestwick Airport, in Scotland, where a number of campaigners were arrested last week after they boarded a US plane.
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