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Yes. On Philippine Airlines, many US/Canada fares include 2 free checked pieces; on weight-based routes you can check two if within your kilo limit.

No—6 oz toothpaste exceeds the 3-1-1 carry-on limit; put it in checked bags. Carry-on tubes must be 3.4 oz (100 mL) or smaller.

Yes. Emirates permits two checked bags. Americas/Africa: most fares = 2 pieces (Economy Special=1). Elsewhere: multiple bags within your kg allowance.

Yes, a 3.38-fl-oz (100 ml) container is allowed in carry-on under the 3-1-1 rule, as long as it fits in your single quart-size liquids bag.

Yes, WestJet lets you bring one carry-on plus one personal item; a small backpack counts as the personal item if it fits under the seat.

Yes, on American you can add your Known Traveler Number after check-in, then reissue your boarding pass to get TSA PreCheck if you’re eligible.

Yes — tasers can be in checked luggage if disabled, with battery rules applied and airline or country limits respected.

Yes, you can add baggage after check-in, but fees rise and each airline sets strict cut-offs online, at kiosks, or at airport counters.

Yes—one-way hold luggage on easyJet is only sold at the airport; online adds a bag to every flight on your booking.

Yes, most airlines let you buy a second adjacent seat (“extra seat”) for comfort or to secure an item, if fare and safety rules are met.