Jet2 has issued a 35-week warning and a 27-week warning. Failure to act could mean you get turned away at the airport . On the Jet2holidays website, it warns people that the airline cannot carry pregnant passengers beyond 35 weeks for single pregnancies or 33 weeks for multiple pregnancies such as twins. From 27 weeks onward, pregnant passengers must provide a specific doctor's certificate with key information. Without this, it notes that passengers may be refused travel. It cautions: "We can't