strikes
The Labour leader's authority is being challenged by frontbenchers after he ordered them not to stand on picket lines.
Boris Johnson warned the public they will have to "stay the course" as a wave of further strikes looms.
The party leader had warned his top team they had to show "leadership" by not joining pro-strike demonstrations.
A shadow cabinet member told HuffPost UK: "It’s a sensible decision given Tories want to blame us for their failings. We mustn’t fall into their trap."
Workers will be striking on Tuesday, Thursday and Saturday this week but protests could last much longer.
Simon Clarke acknowledged that the walkout would be a "huge inconvenience" – but refused to intervene.
The latest move comes after two days of strike action, on September 9 and 10, over a dispute about pay.
Pilots have walked out for two days, in the first strike to ever hit the airline. More than 1,700 flights have been cancelled.
Pilots will walk out on Monday and Tuesday due to an ongoing dispute over pay.
Pilots are threatening to strike in two short bursts – once later this month and again in early September.