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Delivery of macromolecular drugs to airway cells after inhalation can be limited by rapid clearance, in vivo degradation, and poor intracellular targeting. Liposome carriers offer an effective method of improving drug stability, but conventional liposomes have limited intracellular targeting capacity and are cleared rapidly by the lungs. Further modification is required to improve liposome−cell interaction and intracellular targeting. Therefore, we proposed conjugating three arginine-rich membrane translocating peptides, namely, HIV-TAT, Antennapedia, and octaarginine, to neutral liposomes as a biocompatible alternative to cationic lipids for intracellular delivery of macromolecules to airway cells. Conjugation did not significantly affect liposome stability, and each system was nebulized to produce aerosols of mean aerodynamic diameter <1.5 μm. The peptides caused a significant (p < 0.05) increase in liposome−airway …