A standard language variety is a variety that's recognized as more correct* and acceptable than other varieties. Standard varieties have the following prototypical properties, though not all of these properties will be shown by all standard varieties, and non-standard varieties may nevertheless have some of them:
All airlines make up their own rules and regulations regarding pregnant women. Some do not restrict travel at all, no matter what stage of pregnancy a women is in, and others start to restrict at 7 months, although the majority restrict around 36 weeks.
The safest time to fly during pregnancy is before 37 weeks or, if carrying twins, before 32 weeks, new advice says. The Royal College of Obstetricians and Gynaecologists says flying is not harmful during a low-risk pregnancy, but there may be side-effects.