Yes, in Ireland you can take infant formula and breast milk on board a plane, although the baby may need to be present. 

Many airports around the world make allowances for families travelling with baby food, formula and breast milk, although you may be asked to taste the liquid to prove it is harmless when passing through security.

However, not every worldwide airport permits you to fly with formula milk; there are some countries which ban all liquids and gels. If in doubt, call your airline and ask before you fly.

Ready to Use formula can be served safely both chilled and at room temperature. The temperature at which you decide to serve it will depend on your (and your baby’s) preference, as well as what is most convenient for you at the time.

Some parents notice a slight difference in the look and smell of Ready to Use formula compared to formula that has been prepared from powder, due to different processing methods used in production. However there shouldn't be a great deal of variance. 

There is no evidence to suggest that liquid Ready to Use formulas are easier to digest than their powder equivalents, or that they have an impact on stool frequency. If you are concerned about possible constipation we advise you speak to a health care professional. It is also a good idea to check the on-pack preparation instructions are being followed accurately when making up powdered milk.