In 2026, whether you can gate check a full-size suitcase depends on your airline's specific policy and the size of the aircraft. For full-service carriers like Delta or American, if the overhead bins are full, agents will often gate check standard carry-on bags for free. However, a "full-size" checked suitcase (larger than 22" x 14" x 9") is generally not allowed at the gate; you are expected to check these at the main counter. If you bring a large checked-size bag to the gate, most 2026 airlines will charge you the standard checked-bag fee plus an additional "Gate Handling Fee" (approx. $25-$50). On budget airlines like Spirit or Ryanair, this fee can be as high as $100. The exception is for "Valet" service on small regional jets, where even "legal" carry-ons must be checked at the aircraft door. For 2026 travelers, the "pro-tip" is to never assume a gate check is a "free pass" for an oversized bag; if it doesn't fit the sizer, you will likely pay more at the gate than you would have at the check-in desk.